In order to get a working low-power video card setup I decided to use a custom xserver from Andrikos:ppa. It worked well, but when the official release caught up to the bug fixes I dried to drop the PPA packages and there are some of them I can not get rid of.
Packages were from here: https://launchpad.net/~andrikos/
I know how to down grade packages using Synaptic (Force Version...) and apt-get package=version. However, with some of the packages there are so many dependencies that is is no feasible to uninstall them all (as Synaptic wants to do).
This is what I would like to do:
sudo apt-get install -f libncurses5=5.9-10ubuntu4 libncursesw5=5.9-10ubuntu4 libncurses5:i386=5.9-10ubuntu4 libncursesw5:i386=5.9-10ubuntu4 libtinfo5=5.9-10ubuntu4 libtinfo5:386=5.9-10ubuntu4
But I get several hundreds of packages that have to be removed to meet the request. Does anyone have any tips on removing the PPA packages?