Same problem here. The bug is quite obvious: the backup file name is generated *after* the warning is printed. Here's an excerpt of xserver-xorg.postinst around line 1685: warn "$XORGCONFIG has been customized, but we need to make updates. \ Backing up your config to $BACKUP_XORGCONFIG. If we screw something up, \ restore using this file." BACKUP_XORGCONFIG="$XORGCONFIG.$(date '+%Y%m%d%H%M%S')" cp "$XORGCONFIG" "$BACKUP_XORGCONFIG" -- Ciao, Flavio