aptitude forbid-version xserver-xorg-core=2:1.3.0.0.dfsg-12ubuntu8.1 to ignore last xserver-xorg-core package when you ll perform an aptitude upgrade
aptitude forbid-version xserver- xorg-core= 2:1.3.0. 0.dfsg- 12ubuntu8. 1 to ignore last xserver-xorg-core package when you ll perform an aptitude upgrade