So i've heard theres some problems with upgrading from bionic to cosmic. One of them was that luks and grub was changed a bit so that some systems wouldn't boot. If it helps, i installed lubuntu using the option to use the entire disk and encrypt it so it automatically partitioned the disk. I don't want to upgrade unless i know its good to do so.

  • Rumors don't mean much. Read the release notes to be sure. If your data is valuable enough to encrypt, then it seems valuable enough to backup before a release-upgrade. My release-upgrades to 18.10 were smooth and flawless and boring on my systems...but perhaps my systems are different from yours. – user535733 Oct 30 '18 at 13:06
  • I'll have a go on upgrading on a vm first. Otherwise i'll wait for 19.04 to be released. You type 'sudo do-release-upgrade' to upgrade right? – Silentstorm Oct 30 '18 at 22:19
  • You type do-release-upgrade without the sudo. – user535733 Oct 31 '18 at 3:05

tl;dr For me, apparently cryptsetup went missing during the upgrade. So make sure it's installed, then, do sudo update-initramfs -u -k all to ensure that you don't end up with a system you cannot boot.

I had this kind of problem the rumors are about ;) Rebooting an old kernel worked first, but after the next update-initramfs, booting any kernel would fail: WARNING: Failed to connect to lvmetad. Falling back to device scanning. Volume group "xubuntu-vg" not found. Dave up waiting for suspend/resume device

I fixed this by chrooting into the broken system, installing cryptsetup, which apparently went missing during the upgrade (!!), and then properly doing update-initramfs from chroot. This is described here (unfortunately german, and when you follow it, make sure boot is mounted), but hopefully, it's not necessary when you fix the system before rebooting.

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