This all started after a reboot hung for over 5 minutes (Reconfigured the network) & I used the power button to reboot. I was lost for a day or so on what to do- The following is how it was resolved, for the sake of whoever's next. I entered a shell & looked at the the log: File: /var/log/fsck/checkfs Log of fsck -C -R -A -a <date> <version> fsck: cannot check /dev/sdc1: fsck.xfs not found /dev/pve/data: recovering journal /dev/pve/data contains a filesystem with errors, check forced. /dev/pve/data: /lost+found is not a directory (ino=14) /dev/pve/data: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) /dev/sda1: clean, 28/32768 files, 10511/131072 blocks fsck died with exit status 4 <date> Originally I tried to run fsck from a LiveCD & found my CD-ROM was dead. Then ran fsck & xfs_repair from a LiveCD installed to a USB stick (used a GPL app at http://www.linuxliveusb.com/) and they returned no errors. I didn't do anything with LVM because I figured I'd make it worse since I don't quite know what I'm doing in LVM. So I gave up on that route. Now in the shell that I got to during the failed boot I just did: fsck /dev/pve/data & got: /lost+found is not a directory (ino=14) Unlink<y>? yes /lost+found not found. Create<y>? yes Unattached inode 14 Connect to /lost+found<y>? yes Then did again: fsck /dev/pve/data & got: /dev/pve/data: clean, 18/786864 files, 89877/3146752 blocks So then I did: shutdown -r -F now And the next reboot was without issue.