Setfacl command with the -b alternative. This eliminates all supplemental ACL entries and thus fixes the permissions to that no Cygwin processes stay. Be aware: If you wish to conserve your mount points for just a afterwards reinstall, 1st help save the output of mount -m as described at . https://acgwin85184.life3dblog.com/32550196/rumored-buzz-on-acgwin