Item vfs.file.regexp[/etc/issue,"^(.*[0-9])(.*)$",,1,1,\1] returns error "Start line parameter must not exceed end line" on Ubuntu Trusty

A Ubuntu Trusty server is monitored, it has a /etc/issue file containing the line "Ubuntu 14.04.2 LTS \n \l" followed by a blank line.

In Zabbix, an item of type "Zabbix agent" has been added to the "Linux" Template as follow :

vfs.file.regexp[/etc/issue,"^(.*[0-9])(.*)$",,1,1,\1]

It is supposed to return "Ubuntu 14.04.2".

The correct value is returned for agents running on Debian Squeeze/Wheezy/Jessie, Red Hat Enterprise Linux 5/6, Oracle Linux 6, CentOS 6, Ubuntu Precise.

However, for Ubuntu Trusty there's an error "Start line parameter must not exceed end line".