====== apt ======

===== Key von keyserver hinzufügen =====
Ubuntu:
<Code:bash>
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 00000000
</Code>

===== Pakete nicht updaten =====

==== dpkg ====

Put a package on hold

<Code:bash>
echo "package hold" | dpkg --set-selections
</Code>

Remove the hold

<Code:bash>
echo "package install" | dpkg --set-selections
</Code>

Store the list of software to a file called /backup/package-selections (restore see aptitude):

<Code:bash>
dpkg --get-selections >/backup/package-selections
</Code>

==== aptitude ====

Hold a package using

<Code:bash>
aptitude hold package_name
</Code>

Remove the hold with

<Code:bash>
aptitude unhold package_name
</Code>

Restore installed software (store see dpkg):

<Code:bash>
aptitude install $(cat /backup/package-selections | awk '{print $1}')
</Code>