I have same issue with VPS, and same message as the issue mentioned here
Echec de mise à jour de RoundCube - #11 by Jean31
I tried to resolve the same way, but upgrading did not restore my calendars and contacts (empty contacts/calendars in baikal admin console)
I restore to 0.9.4 , upgrade all system and package and upgrade applied 0.11.1 but impossible to load contacts and calendars with my client
I restore to 0.9.4
don’t known what to do …