Benutzer:Rdiez/Linux Ramblings

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Which Linux

I personally recommend Kubuntu, which is an Ubuntu derivative. It's not perfect, but I found the other Linux distributions I tried even more annoying. My advice is:

• If you have Ubuntu 12.04 LTS or some derivative, wait until version 14.04.1, which is scheduled for July 24th.
• For new installations, go for Kubuntu 14.04 LTS.
• Every now and the, upgrade the kernel and X-Windows versions.
  Instead of Service Pack, this kind of upgrade is called LTS Hardware Enablement Stack in the Ubuntu world.
• Skip all the non-LTS versions like 13.10.

Things to Do after Installing Kubuntu 14.04

• System configuration:
  • Are the BIOS and Linux date/time and timezones correct?
  • Is the BIOS set to boot only from the Linux disk?
  • Make the Grub bootloader accessible.
    Otherwise, if you ever to need access to the bootloader, it will be too late.
    Install package kde-config-grub2 and you can configure it with the mouse under System Settings, Startup and Shutdown, GRUB2 Bootloader. Choose "Automatically boot..." after 1 second, so that you have 1 second to press the arrow down key (for example) and stop the boot process.
    Or manually: edit /etc/default/grub, add GRUB_TIMEOUT=1, comment out GRUB_HIDDEN_TIMEOUT, run sudo update-grub2.
    You may also want to remove kernel options quiet and splash in order to see the boot messages.
  • Enable Ctrl+Alt+Backspace to kill the current graphical session.
    If you make a mistake and/or your system becomes unresponsive, this key combination may be the safest and quickest way out. Edit "/etc/default/keyboard", find variable XKBOPTIONS and set it to "terminate:ctrl_alt_bksp".
  • Reduce the amount of reserved disk space.
    On ext4 filesystems, Linux reserves some disk space for privileged processes and to help prevent fragmentation. The default amount of 5 % comes from the times where hard disks were much smaller. You can reduce it to 1 % with command "sudo tune2fs -m 1.0 /dev/sdXY".
    In order to find out how much is reserved: sudo tune2fs -l /dev/sdXY | grep -e "Reserved block count:" -e "Block count:"
  • If connecting a USB stick does not automatically mount it, or it asks too much confirmation, look at System Settings, Removable Devices.
  • Install package "trash-cli" and get used to deleting files with "trash" instead of "rm". If you make a mistake and delete the wrong file, you'll be able to recover it from the desktop trashcan/wastebin.
  • You may want to install legally-encumbered codecs and DVD playback:
    sudo apt-get install ubuntu-restricted-extras libavcodec-extra
    sudo apt-get install libdvdread4
    sudo /usr/share/doc/libdvdread4/install-css.sh
• Performance optimisation:
  • Optimise filesystem performance with noatime.
    Edit /etc/fstab and add options "noatime,commit=30" to your filesystems.
  • Disable unnecessary indexers:
    • KDE Baloo (formerly Nepomuk). Go to System Settings, Desktop Search, and add your home folder, which acts as an indication to turn the indexer off. Later note: they have finally added an "Enable Desktop Search" checkbox with the latest update.
    • KDE Akonadi. Go to System Settings, Personal Information, stop the service.
    • updatedb / locate database. See mlocate conflicting package.
  • Prevent unexpected system updates.
    Unexpected package manager activity in the background can render your PC slow or even unresponsive when you are in a hurry. Configure the system updates to check less often (weekly or every fortnight) and disable automatic installation.
• KDE preferences:
  • Choose "Start with an empty session" in "System Settings", "Startup and Shutdown", "Session Management".
    You will probably want to untick option "Confirm logout" too.
  • Configure Keyboard shortcuts like under Windows: Go to "System Settings", "Shortcuts and Gestures", and then:
    • Ctrl+Esc should bring up the start menu: "Global Keyboard Shortcuts", "Plasma Desktop Shell", "Activate Application Launcher Widget".
    • Ctrl+Shift+Esc should bring up the Task Manager: "Custom Shortcuts", "Edit", "New", "Global Shortcut", "Command/URL", "Trigger", set Ctrl+Shift+Esc, "Action", enter "ksysguard".
    • Alt+Space should bring up the window menu: "Global Keyboard Shortcuts", "Kwin", "Window Operations Menu" ("Fensteraktionen-Menü in German).
    • Toggle Touchpad (on laptops): "Global Keyboard Shortcuts", "Touchpad KCM".
  • Remove some keyboard shortcuts that tend to conflict with other apps, like the following (is there a way to find a KDE shortcut by key combination in all "KDE components"?):
    • Global Keyboard Shortcuts, KWin: Ctrl+F1 ... Ctrl+F7.
  • If the window resize borders are too thin and therefore hard to hit: Go to "System Settings", "Workspace Appearance", "Window Decorations", "Configure Decoration...", "General", "Border size".
  • Add pavucontrol ("PulseAudio Volume Control") to your favourites.
    You may need to install package pavucontrol first. The standard volume control applet does not let you choose where an application like Skype should be recording the audio from.
  • Install plug-ins for the Dolphin file manager. Install package ruby. Then open the file manager, go to Control, Configure Dolphin..., Services, Download New Services.... Add "Root Actions Servicemenu" and "Scan with ClamAV".
  • The User Manager tool in System Settings is useless. Install package kuser, and run "sudo kuser" instead (or KUser from the menu).
  • Minimised windows get very pale taskbar icons and captions, making it hard to tell which window they represent.
    To fix that for the icons: Go to System Settings, Application Appearance, Icons, Advanced, Desktop, click on Set Effect for the Disabled icon, select "No Effect" and untick the "Semi-transparent" option.
    Unfortunately, I don't know how to fix that for the caption texts yet.
  • emacs warns: "Buffer 'somefile.txt" still has clients; kill it?". Go to System Settings, File Associations, text, plain, emacsclient, Edit..., Application, "Command:", enter "emacsclient --no-wait".

For PCs with only 512 MiB RAM

512 MiB of RAM is too little nowadays for Ubuntu-based system. Starting the package manager is already a heavy load for such a computer. Here is some suggestions:

• Get rid of apt-xapian-index, see Fake Replacement for Debian Package apt-xapian-index
• Switch to a lightweight Web browser like Midori.
  You will lose some comfort, and some pages will not display properly, but Firefox and Chromium are just too heavy.
• Optimise your swap:
  • Move your swap partition to another drive.
    • If you have more than one drive, move the swap partition or file to the least-busy disk.
    • Try swapping to a USB stick. Here is a how-to guide.
    • If the computer has a memory card reader, you could use a fast memory card as the main swap drive.
      I have seen great swap performance improvements even with a standard 512 MB SD card (8.5 MB/s read speed, 2.5 MB/s write speed, 1 ms seek time) from an old digital camera connected over a cheap USB 2.0 card reader. The reason behind the improvements are probably the card's fast seek time and the lower pressure on the main hard disk.
    • If your video card has a lot of memory, some people have managed to use some of it as a swap device.
  • Reduce the swappiness from the default 60 to 10.
    Whether this will improve swapping is debatable. It is probably a good idea only if you cannot move your swap partition to another drive. Add "vm.swappiness = 10" to file "/etc/sysctl.conf".
  • Try swapping to zram. It made things worse for me, but your mileage may vary.
• Switch to a lightweight Linux distribution.
  Xubuntu or Lubuntu will not bring much. You could try Puppy Linux.

KDE Ramblings

KDE Tips

• Useful keyboard shortcuts are:
  • Ctrl+Alt+Esc: Kill window on click, similar to starting xkill.
  • Ctrl+Alt+L: Lock desktop.
• Emptying the Trash takes forever, and manually deleting the ".Trash-1000" directory with the mouse tends to yield an error. To overcome it, hold the shift key while pressing the delete key on that directory. Alternatively, right-click on the folder to get the pop-up menu, and then hold the shift key and watch how the "Move to Wastebin" entry mutates to "Delete". Release the shift key and it will go back to normal. That only works if there is no submenu open at that time.

KDE Rants

KDE Rant about ".directory" files:

• KDE tends to litter your hard disk with hidden ".directory" files, and there is no way to prevent it. It just remember the view settings for the last N directories, like Windows does, and it should cache those settings somewhere under $HOME instead of creating those pesky files all over the place.
• The Dolphin file manager does not display MP3 ID tags like everybody else. Older versions used to (!).
• The "safely remove" eject icon for USB drives is often missing from the "device notifier" pop-up window. Sometimes it is because the file system has not been mounted automatically. But sometimes, there is no real reason. If you then open a Dolphin window and right-click on the USB drive mount on the left panel, the eject option is shown there.