GNU/Linux Desktop Survival Guide by Graham Williams
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Nextcloud Locked File Problem

20170922 A file locked error can occur with Nextcloud. If it does not resolve itself a solution is:

$ ssh nextcloud.myserver.com 
$ occ maintenance:mode --on
$ mysql -u nextcloud -p 
> use nextcloud 
> DELETE FROM oc_file_locks WHERE 1; 
> Ctrl-D
$ occ maintenance:mode --off