====== Architektúra váltás ======
  * https://wiki.debian.org/CrossGrading

<blockquote>
  - Add the new architecture <code bash>
dpkg --print-architecture
# i386

dpkg --add-architecture amd64

dpkg --print-foreign-architectures
# amd64

apt-get update
</code>
  - Install a kernel that supports both architectures in userland <code bash>
apt-get install linux-image-amd64:amd64

reboot
</code>
  - Crossgrade ''dpkg'' ''tar'' and ''apt''<code bash>
apt-get clean

apt-get upgrade

apt-get --download-only install dpkg:amd64 tar:amd64 apt:amd64

dpkg --install /var/cache/apt/archives/*_amd64.deb

dpkg --print-architecture
# amd64

dpkg --print-foreign-architectures
#i386
</code>
  - Swap arch of libs<code bash>
dpkg --get-selections \
    | grep ':i386' \
        | sed -e 's/:i386/:amd64/' \
            | dpkg --set-selections

apt-get -f install
</code>
</blockquote>

  - Architektúra beállítása (''/etc/apt/apt.conf.d/00arch''): <file bash 00arch>
APT::Architectures "amd64,i386";
</file>
  - ''apt'' takarítása <code bash>
apt-get clean

rm -rf '/var/lib/apt/lists'

apt-get update
</code>
  - ''dpkg'' ''available'' újragenerálása <code bash>
dpkg --clear-avail

du '/var/lib/dpkg/available'
# 0       /var/lib/dpkg/available

find '/var/lib/apt/lists' -name '*_Packages' -exec dpkg --merge-avail {} \;

du '/var/lib/dpkg/available'
# 67872   /var/lib/dpkg/available
</code>