I followed the Ubuntu 12.04 to 14.04 upgrade guide which went well so far using Virtualmin GPL. I did not upgrade an server with existing Virtual servers yet but a test instance using a fresh 12.04 system.
virtualmin restore-domain 'ing a Virtual server from a production server I got this error during restoring:
Applying web server configuration ..
.. failed! An Apache configuration error was detected : AH00526: Syntax error on line 11 of /etc/apache2/sites-enabled/foo.bar.conf:
Either all Options must start with + or -, or no Option may.
Action 'configtest' failed.
Problem seems to be the mixing of Apache Options with a + or - with those without which is not valid syntax, and will be rejected during server startup by the syntax check with an abort. according to http://httpd.apache.org/docs/2.4/mod/core.html#options
Are there any workarounds I can use right now? Do you plan to fix this in future Virtualmin Server releases?