Docker won't start after 'some' update ( kernel 5.9.11 )

[cscs]

@mcrose

dic 23 17:43:13 dockerd[544]: time="2020-12-23T17:43:13.910577329-03:00" level=error msg="AUFS was not found in /proc/filesystems" storage-driver=aufs
dic 23 17:43:13 dockerd[544]: time="2020-12-23T17:43:13.910775363-03:00" level=error msg="[graphdriver] prior storage driver aufs failed: driver not supported"
dic 23 17:43:13 dockerd[544]: failed to start daemon: error initializing graphdriver: driver not s

that seems to be your problem.