Well, it was not the screensaver, but rather hibernate that made the problem. Default in the preferences for powermanager > system > battery is hibernate. I chose 16 min. However, since Asus eee has 16 GB ssd- harddisk only, I had not established a swap partition. (I guess that is the reason why I cannot select hibernate anywhere else in the preferences.)
Thus, the system hibernated without being able to save the ram-content and thus unable to restart. The kernel panic arose due to: Initramfs unpacking failed: junk in compressed archive But, as it could not restart, it could not remove the information that told the laptop to start from hibernate. Thus, kernel panic persisted every time it rebooted. But, booting from a usb-stick removed the wakeup from hibernate information, and the same did chekking the memory instead of booting from the Grub consol. Two recommendations for default prefecences: 1. preferences > lxsession > screensaver = xscreensaver 2. If there is no swap-partition: preferences > power management > system > battery = suspend. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1735721 Title: screensaver freeze and kernel panic in lubuntu 17.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxsession/+bug/1735721/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
