Linux (Kubuntu) installation

Linux

Keywords: Linux, Installation, Kubuntu 12.10, Kubuntu 13.10, Kubuntu 14.04, Kubuntu 16.04

Linux Admin memo

Kubuntu 20.04 kubuntu 20.04

Linux Install memo

Kubuntu 16.04 install memo (Windows 10 with Oracle VirtualBox)

When you install to high resolution notebook, Kubuntu's installer is nearly readable. Set Oracle Virtuabox: View-Scale factor 200% helps.
I choose home directory encryption. Some web sites said it is not good to encrypt the disk. But if the reason is 'Difficult to recover', this is not the case for me. The point to encrypt my notebook disk is if I forget the notebook or it is stolen, I need to protect my information. I need to make my disk difficult to recover, that is the point. For me these pages completely miss the point, why you will encrypt your disk? Thus, I need to have a back up scheme. Of course the performance is one concern, but this is trade off. Both at my work and personal, information is more important.
Windows folder mount problem: When I get
```
    sudo mount -t vboxsf foo bar
    mount: unknown filesystem type 'vboxsf'
        
```
I need Guest Addition CD Image install. VirtualBox. Choose it with Device menu. Kubuntu's Device Notifier tells the CD is in, then open with File Manager once to mount the CD in Kubuntu. Then you will see it at /media/$USERNAME/VBOXADDITIONS_5.0.30_112061 (for example, depends on the VirtuakBox version). Then, run the script.
```
        % sudo ./VBoxLinuxAdditions.run
        
```
Frequently crash the plasmashell
- Problem: I constantly got a plasmashell crash with segmentation fault 11.
```
          Application: Plasma (plasmashell), signal: Segmentation fault
          Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
          [Current thread is 1 (Thread 0x2afa1a0a30c0 (LWP 1913))]
          ...
            
```
- Possible cause: This looked random, but here is a hint. https://bugs.kde.org/show_bug.cgi?id=363371. When you hover one of the task list and it is often crash the plasmashell to see the thumbnail. Or sometimes you can see the thumbnails of the screen. This means some graphics related library. The report said llvmpipe has a problem.
- Workaround: Disable the dynamic window thumbnail creation. Use System settings. Workspace -- Desktop Behaviror -- Workspace. Uncheck the Show information Tips. Now you don't see the miniature of your window, but, for my case, the annoying crash seems gone.

Kubuntu 14.04 t0 16.04 upgrade memo

After I dist-update from Kubuntu 14.04 to 16.04, I got the following error.

  dpkg: error processing gcc-doc (--remove):
  Package is in a very bad inconsistent state - you should
  re-install it before attempting a removal.
  Errors were encountered while processing:
   gcc-doc
  E: Sub-process /usr/bin/dpkg returned an error code (1)

All the following attempt didn't work:

  # sudo dpkg --remove --force-remove-reinstreq gcc-doc
  # sudo dpkg --configure -a
  # sudo apt-get clean
  # sudo apt-get autoclean

The following method worked for me, but this is risky since it uses neither apt-get nor dpkg. Please aware the risk.

  # find /var/lib/dpkg/info/ -name *gcc-doc* -print | xargs rm
  # sudo apt-get update; sudo apt-get upgrade;
  # sudo apt-get install gcc-doc

Disable Akonadi, Nepomuk, and mysql for them. (I also use some small memory system.)
- Cotrol-F2 to get command window. Push the wrench icon to see available plugins.
- Disable Nepomuk desktop search, calender events, contacts.
- Disable in Digital clock calender, Display events.
- run # akonadictl stop
# turn off the touchpad while typing. This makes easy to type on laptop. At a command line
- (old) # synclient TouchpadOff=1
- (new) # tpconfig TouchpadOff=1

skk setup. In .emacs,

     (require 'skk-autoloads)
     (global-set-key "\C-x\C-j" 'skk-mode)
     (global-set-key "\C-xj" 'skk-auto-fill-mode)

in .skk,

     (setq skk-large-jisyo "/usr/share/skk/SKK-JISYO.L")

Local network configuration (static IP address setting on a machine) on Kubuntu 12.10
- Check the following addresses given by DHCP server before change.
  - gateway: netstat -nr
  - DNS server: I can find it /var/lib/dhcp/dhclient.leases on Kubuntu 12.10. Note: nslookup gives you loopback (127.0.0.1), it is not the one
- Remove network-manager (It seems this does something strange)
- Install wicd (need a reboot)
- Check the your router's DHCP settings
  In my case, I use O2/Alice box, I can access to the box by http://192.168.1.1/ from inside of the network. Then set some address will never assigned by the DHCP. We can use these static IP address.
- Use wicd client and use property. Check "Use static IP". netmask and gateway will be given. Set DNS server 1 as you have looked up before.

Local network configuration (static IP address setting on a machine) on Kubuntu 13.10.
Kubuntu 13.10 updated /etc/network/interfaces. Even wicd said static IP, it seems dhcp does something. It caused the following error periodically (around every minutes) in a message popup.

     device failed to activate
     IP configuration is unavailable

if the /etc/network/interfaces file is like,

     auto lo eth0
     iface lo inet loopback
     iface eth0 inet dynamic

Then, this is not static IP. In that case, the following procedure helped me out.

Check the gateway address by netstat -nr
Edit /etc/network/interfaces file.

          auto lo eth0
          iface lo inet loopback
          iface eth0 inet static
            address (static IP address of your machine)
            netmask (your netmask, like 255.255.255.0)
            gateway (gateway address taken by netstat -nr)

Check the /etc/resolve.conf which should have your nameserver. This depends on your system, for example:

          nameserver 192.168.1.1
          nameserver 127.0.0.1
          search localdomain

Restart the network service

          # sudo service networking status
          # sudo service networking restart

Check the IP address has been set.
```
          # sudo ifconfig
            
```