A possible workaround is to add "/usr/lib/xorg/modules/extensions" to e.g. update-manager-core.list before the ugprade starts so that the directory is still around when xserver-xorg-core gets removed.
A possible workaround is to add "/usr/lib/ xorg/modules/ extensions" to e.g. update- manager- core.list before the ugprade starts so that the directory is still around when xserver-xorg-core gets removed.