The code that causes behavior reported in Comment #4 (at least in Trisquel): cat /var/lib/dpkg/info/lightdm.config
# set default display manager DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager [...] # debconf is not a registry; use the current contents of the default display # manager file to pre-answer the question if possible if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then CURRENT_DEFAULT=$(basename "$(grep -v '^[[:space:]]*#' \ "$DEFAULT_DISPLAY_MANAGER_FILE" | head -n 1)") if [ -n "$CURRENT_DEFAULT" ]; then db_set shared/default-x-display-manager "$CURRENT_DEFAULT" fi else CURRENT_DEFAULT= if db_get shared/default-x-display-manager; then CURRENT_DEFAULT="$RET" fi fi -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1020770 Title: gdm install prompts about dm when debconf value set To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/1020770/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs