File Manager does not work on a new NG server:
Invalid backend response. Data is not JSON.
pemcln group has ID different from 10003:
# grep pem /etc/group pemcln:x:10001:
pemcln group was added before the NG related installation tasks. As a result, it has incorrect ID.
pemcln group has the ID of 10003 on the NG server.
# groupdel pemcln # groupadd -g 10003 -f pemcln