Comment 18 for bug 1916715

I just hit this issue on the UCA bionic-ussuri version, as part of testing automated OpenStack upgrades. This library is pulled in as a cinder "suggested" package, and under my testing it broke on the upgrade from the UCA bionic-train version to UCA bionic-ussuri.

The fix for the issue was exactly as Adam said in comment #5. While this is on Bionic, systemd is in play here and the invalid definition in /lib/systemd/system/rtslib-fb-targetctl.service is impacting in this case. The bionic-train version doesn't have the offending mkdir call at all; the bionic-ussuri version introduces the bugged version (i.e. "ExecStart=mkdir -p /etc/rtslib-fb-target").