Your linux distribution may run some maintenance jobs or checks daily and you may get things like the following in your email:
'<USERNAME>' is a member of the 'httpd' group in /etc/group but not in /etc/gshadow
The grpconv command creates gshadow from group and an optionally existing gshadow.
$ sudo grpconv
user 'jira': directory '/home/jira' does not exist
Simple create the folder and change its permissions:
$ sudo mkdir /home/jira $ sudo chown jira:jira /home/jira -Rfv