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/etc/fstab, and there's no entry for the/sys/fs/cgroup, so I don't know how it got mounted, nor what options might have been used. Where should I look?/proc/mountsto see what is mounted. A convenient shortcut:df <directory>will tell you where the mountpoint is, and might give you some hints about what the filesystem is./proc/mountsshows the following lines:cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0, andnone /dev/cpuset cgroup rw,relatime,cpuset,noprefix,release_agent=/sbin/cpuset_release_agent 0 0.