A disk quota is a limit set by a administrator that restricts usage of file system in Operating Systems. The function of setting quotas to disks is to allocate limited disk-space for accounts according to shared hosting packages.
When updating them on your server, it throws a error as below.
edquota: Cannot stat() mounted device /dev/root: No such file or directory
No filesystems with quota detected.
Looking at the error, it looks like /dev/root does not exists. Check if it does.
# ll /dev/root
If it does not exists, create it with command
# ln -s /dev/xvda /dev/root
Now, time to update quota on your server.
# /scripts/fixquotas –force