It is super-easy to reproduce here at least. I tried 18.04 with the ubuntu and the xubuntu CD. Chose default options, except for wanting LVM (and a Danish keyboard).
System gets created fine. At all boots after that, it shows "WARNING:Failed to connect to lvmetad. Falling back to device scanning." at the beginning of the boot process, and then after approx 30 seconds: "Gave up waiting for suspend/resume device /dev/mapper/xubuntu--vg-root: clean XXX/XXX files, XXX/XXX blocks" See https://i.imgur.com/66bYGky.png or attached ** Attachment added: "Screenshot" https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1768230/+attachment/5135628/+files/Screenshot_2018-05-07_22-24-04.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1768230 Title: Long time booting : Failed to connect to lvmetad. Falling back to device scanning. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1768230/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs