====== Ubuntu ======
  sudo apt-get update
  sudo apt-get upgrade
  sudo apt-get dist-upgrade

  sudo atp-cache search build*

This link describes desktop and server release upgrade procedures
[[http://www.howtoforge.com/how-to-upgrade-ubuntu-8.04-to-ubuntu-8.10-desktop-and-server]]

List package names available
  apt-cache pkgnames

Others  

[[http://www.thegeekstuff.com/2009/10/debian-ubuntu-install-upgrade-remove-packages-using-apt-get-apt-cache-apt-file-dpkg/]]
  apt-cache search ^apache2$
  apt-cache search "Apache HTTP Server"
  apt-cache show apache2
  apt-cache showpkg apache2
  apt-file list apache2 |more
  apt-file search apache2.conf
  apt-cache depends apache2
  dpkg -l |grep -i apache
  sudo apt-get install apache2
  dpkg -l |grep apache
  sudo apt-get purge apache2 (removes configuration files)
  sudo apt-get remove apache2 (leaves configuration files)
  sudo apt-get -u install apache2 (update only specified package)
  sudo apt-get -u upgrade (Upgrade all packages)

=== agt-get secrets ===

http://blogs.pcworld.co.nz/pcworld/tux-love/2010/07/hidden_linux_agtget_secrets.html

== The basics ==

Resynchronise installed packages with their sources. (Always do this before an upgrade.)
  apt-get update

Install the newest version of all packages installed on the system.
  apt-get upgrade

Upgrade to the latest version of your distribution.
  apt-get dist-update

Install programs xxx, yyy and zzz along with all their dependencies.
  apt-get install xxx yyy zzz

Remove programs xxx, yyy and zzz.
  apt-get remove xxx yyy zzz

Remove programs xxx, yyy and zzz and delete any configuration files that they used.
  apt-get purge xxx yyy zzz

Update the package cache and check for any broken dependencies.
  apt-get check

Clean out retrieved package files.
  apt-get clean

Clean out retrieved package files, but only those that are no longer needed.
  apt-get autoclean

Remove any packages that were installed to satisfy dependencies but are no longer required.
  apt-get autoremove

== Advanced stuff ==

So much for the basics, what about those neat tricks I mentioned? Well, did you know you can use apt-get to get a package’s source code?

Retrieve source files for package xxx.
  apt-get source xxx

Or its build dependencies?

Get all the dependencies needed to build package xxx.
  apt-get build-dep xxx

Or that you could get it to fetch and build the package for you?

Fetch the source code then compile it. (The -b switch means ”build it„.)
  apt-get source xxx -b

The result with be a .deb package which you can install using the Debian package manager command:

  dpkg -i xxx.deb

== Really advanced stuff ==

  apt-get moo
Try it! :)

==== Audio troubles? ====
[[https://wiki.ubuntu.com/Gutsy_Intel_HD_Audio_Controller]]



====== apt ======
[[http://www.freesoftwaremagazine.com/columns/beyond_synaptic_using_apt_better_package_management]]
=== apt-update ===
  :~$ sudo apt-update
=== apt-cache ===
  :~$ sudo apt-cache search gnumeric
  :~$ sudo apt-cache search spreadsheet
  :~$ apt-cache search show inkscape
  :~$ apt-cache depends python
  $ apt-cache show (show is another useful one)
=== apt-get ===
  :~$ apt-get install gnumeric
  :~$ apt-get remove inkscape
  :~$ apt-get autoremove

====== dpkg ======
== search for package using file (like provides) ==
  dpkg -S mpirun
== list files in a package ==
  cd /var/cache/apt/archives/
  dpkg -c openmpi-bin_1.2.5-1ubuntu1.1_i386.deb


====== dpkg-deb ======


====== update-alternatives ======
In trying to add openmpi to AUR systems, a problem was encountered because lam-mpi was already installed.  Once links have been manually modified, the system, via /var/lib/dpkg/alternatives remembers the change and marks the link as manual.  On another system, removal of the /usr/bin/mpirun link caused apt-get remove/install to not create the link either.  To fix it, mark the package auto remove and then install it
  update-alternatives --auto mpirun
  sudo apt-get remove openmpi-bin
  sudo apt-get install openmpi-bin
====== compiz ======
  sudo apt-get install compizconfig-settings-manager
====== proprietary software ======
[[http://www.theregister.co.uk/2010/06/24/reg_linux_guide_3/page2.html]]

Adobe Flash player, Java, support for MP3, MP4 and mor
  sudo apt-get install ubuntu-restricted-extras icedtea6-plugin
====== Medibuntu ======
[[http://www.theregister.co.uk/2010/06/24/reg_linux_guide_3/page2.html]]

http://medibuntu.org/

  sudo wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring && sudo apt-get --quiet update

After this, you can just install the last few bits:

  sudo apt-get install app-install-data-medibuntu apport-hooks-medibuntu libdvdcss2 w32codecs

This adds entries for the new toys in the GUI, but more importantly, DVD support and the Windows media codecs.  (If you're running 64-bit Ubuntu, use "w64codecs" instead.) Ideally, read the instructions on the Medibuntu site.