The openvpn of my company is pushing about 250 routes. I can connect by the command line interface of openvpn by using max-routes 300 in the clients config file. By importing this file into nm, this setting is ignored and the connection fails due to too many routes. There is already a bug report upstream, nevertheless, I'm searching for a workaround for the few colleagues running linux. All of them run ubuntu, therefore a ubuntu-specific workaround would help.

To give some starting point, what I searched for and google was not answering is the possibility of a global configuration of openvpn options to set max-routes or the ability to give nm additional options that don't show up in the gui.

Solved: The upstream problem was solved about 1 year ago. Unfortunately too late for me since I left the company, and there's no other linux machine left, they are purely running Windows and Apple now.