Tag Archives: ubuntu

Install Docker Engine on Ubuntu

Posted on by

Reading about how to Install Docker Engine on Ubuntu. I suppose it’s about time.

-------------------
Thu Nov 11 20:38:18 [bash:5.0.17 jobs:0 error:0]
root@tact:/home/jj5
# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:cc15c5b292d8525effc0f89cb299f1804f3a725c8d05e158653a563f15e4f685
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

Installing Kubuntu

Posted on by

So basically I want to run KDE Plasma under Ubuntu and this can be called Kubuntu.

This article is a little bit cargo-clutish. I.e. “I did this and it seemed to work.” and “I don’t do this because it didn’t seem to work.”

I have a pretty heavy reliance on Salt Stack for system configuration. My salt config is all built around Ubuntu 18.04 LTS.

When I need to install a Kubuntu desktop, this is how I do it:

  1. install Ubuntu Server 18.04 LTS from live installer
  2. apt update && apt dist-upgrade && apt autoremove && reboot
  3. apt install kubuntu-desktop && reboot
  4. apt install virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11 && reboot
  5. apt install salt-minion
  6. vim /etc/salt/minion_id
  7. vim /etc/salt/minion.d/minion.conf
    • master: salt.staticmagic.net
  8. service salt-minion restart
  9. salt-call state.highstate

Note that if your Kubuntu install is a VirtualBox guest you need to start it with a normal start if you want the shared clipboard to work. If you start headless or detachable the shared clipboard will not work (in my experience).

If your Kubuntu install is not a VirtualBox guest you can skip the virtualbox-guest-* package installation above.

Shared clipboard for Ubuntu 18.04 guest in Ubutnu 18.04 host under VirtualBox 6.0

Posted on by

My shared clipboard wasn’t working for my Ubuntu 18.04 guests running on my Ubutnu 18.04 host under VirtualBox 6.0.

To fix first make sure that the shared clipboard is enabled in VirtualBox for the VM. The setting for that is under General -> Advanced -> Shared Clipboard.

Then try running these commands in the guest:

  • sudo apt install virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11
  • sudo reboot

These steps (or something similar) got the shared clipboard working for me. Hooray!

Note that these instructions will vary if you’re running a HWE kernel.

DRI3

Posted on by

Today I was reading How to Install The Latest AMD Radeon Drivers on Ubuntu 18.04 Bionic Beaver Linux wherein I read that “[enabling] DRI3 will increase graphical performance with the AMDGPU drivers”. You can read about DRI3 but the bottom line was to add the following to your /etc/X11/xorg.conf file:

Section "Device"
  Identifier "AMDGPU"
  Driver "amdgpu"
  Option "AccelMethod" "glamor"
  Option "DRI" "3"
EndSection

GRUB_CMDLINE_LINUX_DEFAULT

Posted on by

I had a system which failed to boot. The last lines printed to the screen, which were not relevant to the problem, were:

 [19.957783] async_tx: api initialized (async)
 [20.899732] Btrfs loaded, crc32c=crc32c-intel

Then a little bit later:

 [32.469926] random: crng init done
 [32.470551] random: 7 urandom warning(s) missed due to ratelimiting

The full problem description is here. And the solution is here (careful about the typo on that page, the only relevant setting is GRUB_CMDLINE_LINUX_DEFAULT).

Basically the problem was a bogus GRUB_CMDLINE_LINUX_DEFAULT setting in /etc/default/grub applied by my salt config. I fixed the setting which fixed the issue.

Fixing CA Certificates after upgrade to Ubuntu 14.04.1

Posted on by
Reply

After using do-release-upgrade to upgrade Ubuntu to version 14.04.1 I started having the following problem:

root@orac:/root# wget https://www.progclub.org/robots.txt                                                      
--2014-11-20 13:49:28--  https://www.progclub.org/robots.txt                                                   
Resolving www.progclub.org (www.progclub.org)... 67.207.128.184                                                
Connecting to www.progclub.org (www.progclub.org)|67.207.128.184|:443... connected.                            
ERROR: cannot verify www.progclub.org's certificate, issued by '/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA’:                                                  
  Self-signed certificate encountered.                                                                         
To connect to www.progclub.org insecurely, use `--no-check-certificate'.

To start with I did this:

root@orac:/root# cd /etc/ssl/certs
root@orac:/etc/ssl/certs# mv ssl-cert-snakeoil.pem ../
root@orac:/etc/ssl/certs# cd /etc/ssl/private
root@orac:/etc/ssl/private# mv ssl-cert-snakeoil.key ../

Then I got rid of the symlink(s) for the ssl-cert-snakeoil.pem, e.g.:

root@orac:/etc/ssl# cd /etc/ssl/certs
root@orac:/etc/ssl/certs# ll | grep 'snake'
lrwxrwxrwx 1 root root   21 Jan 10  2012 c8882f98 -> ssl-cert-snakeoil.pem
lrwxrwxrwx 1 root root   21 Mar 25  2014 c8882f98.0 -> ssl-cert-snakeoil.pem
root@orac:/etc/ssl/certs# mv c8882f98* ../

Then I ran: dpkg-reconfigure ca-certificates:

root@orac:/root# dpkg-reconfigure ca-certificates

On the first screen I selected ‘ask’:

  ┌───────────────────────────────────┤ ca-certificates configuration ├────────────────────────────────────┐   
  │ This package may install new CA (Certificate Authority) certificates when upgrading. You may want to   │   
  │ check such new CA certificates and select only certificates that you trust.                            │   
  │                                                                                                        │   
  │  - yes: new CA certificates will be trusted and installed;                                             │   
  │  - no : new CA certificates will not be installed by default;                                          │   
  │  - ask: prompt for each new CA certificate.                                                            │   
  │                                                                                                        │   
  │ Trust new certificates from certificate authorities?                                                   │   
  │                                                                                                        │   
  │                                                  yes                                                   │   
  │                                                  no                                                    │   
  │                                                  ask                                                   │   
  │                                                                                                        │   
  │                                                                                                        │   
  │                                                                                                    │   
  │                                                                                                        │   
  └────────────────────────────────────────────────────────────────────────────────────────────────────────┘

On the next screen I unselected everything:

Package configuration                                                                                          
                                                                                                               
  ┌────────────────────────────────────┤ ca-certificates configuration ├────────────────────────────────────┐  
  │ This package installs common CA (Certificate Authority) certificates in /usr/share/ca-certificates. .   │  
  │ Please select the certificate authorities you trust so that their certificates are installed into       │  
  │ /etc/ssl/certs. They will be compiled into a single /etc/ssl/certs/ca-certificates.crt file.            │  
  │                                                                                                         │  
  │ Certificates to activate:                                                                               │  
  │                                                                                                         │  
  │    [ ] mozilla/ACEDICOM_Root.crt                                                                    ↑   │  
  │    [ ] mozilla/AC_Raíz_Certicámara_S.A..crt                                                         ▮   │  
  │                                                                                                         │  
  │                                                                                                         │  
  │                                                                                                     │  
  │                                                                                                         │  
  └─────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Then I ran: dpkg-reconfigure ca-certificates again:

root@orac:/root# dpkg-reconfigure ca-certificates

On the first screen I selected ‘ask’:

  ┌───────────────────────────────────┤ ca-certificates configuration ├────────────────────────────────────┐   
  │ This package may install new CA (Certificate Authority) certificates when upgrading. You may want to   │   
  │ check such new CA certificates and select only certificates that you trust.                            │   
  │                                                                                                        │   
  │  - yes: new CA certificates will be trusted and installed;                                             │   
  │  - no : new CA certificates will not be installed by default;                                          │   
  │  - ask: prompt for each new CA certificate.                                                            │   
  │                                                                                                        │   
  │ Trust new certificates from certificate authorities?                                                   │   
  │                                                                                                        │   
  │                                                  yes                                                   │   
  │                                                  no                                                    │   
  │                                                  ask                                                   │   
  │                                                                                                        │   
  │                                                                                                        │   
  │                                                                                                    │   
  │                                                                                                        │   
  └────────────────────────────────────────────────────────────────────────────────────────────────────────┘

On the next screen I selected everything:

Package configuration                                                                                          
                                                                                                               
  ┌────────────────────────────────────┤ ca-certificates configuration ├────────────────────────────────────┐  
  │ This package installs common CA (Certificate Authority) certificates in /usr/share/ca-certificates. .   │  
  │ Please select the certificate authorities you trust so that their certificates are installed into       │  
  │ /etc/ssl/certs. They will be compiled into a single /etc/ssl/certs/ca-certificates.crt file.            │  
  │                                                                                                         │  
  │ Certificates to activate:                                                                               │  
  │                                                                                                         │  
  │    [*] mozilla/ACEDICOM_Root.crt                                                                    ↑   │  
  │    [*] mozilla/AC_Raíz_Certicámara_S.A..crt                                                         ▮   │  
  │                                                                                                         │  
  │                                                                                                         │  
  │                                                                                                     │  
  │                                                                                                         │  
  └─────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Then magically everything was working again!

root@orac:/root# wget https://www.progclub.org/robots.txt
--2014-11-20 14:35:50--  https://www.progclub.org/robots.txt
Resolving www.progclub.org (www.progclub.org)... 67.207.128.184
Connecting to www.progclub.org (www.progclub.org)|67.207.128.184|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 364 [text/plain]
Saving to: 'robots.txt.1’

100%[=====================================================================>] 364         --.-K/s   in 0s      

2014-11-20 14:35:51 (8.54 MB/s) - 'robots.txt.1’ saved [364/364]