Package: cgroupsfs-mount Version: 1.3 Upon installing "stretch" over a "jessie" system and rebooting, the boot halts with the message: ---------------------------------------- You are in emergency mode. After logging in, type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or ^D to try again to boot into default mode.
Cannot open access to console, the root account is locked. See sulogin(8) man page for more details. ---------------------------------------- then something like "Enter to continue". But hitting "Enter" just redisplays the message. With some hints from the travails of the Raspbian crowd, I found that the message emanates from /lib/systemd/system/emergency.service, and the latter part can be worked around temporarily by adding "--force" to "sulogin". That permits me to log in, where journalctl shows errors (that I didn't write down) related to "cgroup". Raspbian users also were foiled by invalid entries in /etc/fstab. I found this old entry: ---------------------------------------- none /cgroup group defaults 0 0 ---------------------------------------- Commenting that out allowed the boot to complete. I notice now some /var/log/syslog entries like: ---------------------------------------- systemd[1]: Cannot create mount unit for API file system /cgroup. Refusing. ---------------------------------------- which started before the failed reboot, and after I started installing "stretch". This system was originally loaded with "squeeze" or earlier. That line was a leftover from long ago; /etc/fstab's mtime was Dec. 2010. I know it's fashionable these days to blow away systems completely rather than upgrade. :shrug: I'm guessing here at the appropriate package/version; I imagine that the package that installed this entry no longer exists.
