Hi a saver version would be:
BAD_LIBS=`dpkg -l "*:i386" | grep 'ii' | awk '{ print $2 }' | tr '\n' ' '`
echo $BAD_LIBS > BAD.bck
AUTO=$(apt-mark showauto $BAD_LIBS)
echo $AUTO >auto
sudo apt-get remove $BAD_LIBS
#sudo apt-get purge libgl1-mesa-swx11 # if you get a message about
libgl1-mesa-swx11 problem
sudo ppa-purge ppa:xorg-edgers/ppa
sudo apt-get install $BAD_LIBS
sudo apt-mark auto $AUTO
in case the terminal crashes you have backup information about packages
and status
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https://bugs.launchpad.net/bugs/892886
Title:
ppa-purge is not multi-arch aware
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