For work, I have to use Cisco Anyconnect as a VPN connection.  For a long time I would just use the Cisco AnyConnect official client for linux.  This software is problematic, buggy, and just plain out gives me heartburn.  So one day I came across OpenConenct, which is an open source alternative to the AnyConnect client.  It will talk to an AnyConnect gateway, and can be directly installed via Fedora's package manager.  This also works on Ubuntu, but I don't run Ubuntu, so you're on your own.

I have sort of a history of bending android devices to my will.  It's sort of what I do, and while I'm not going to claim credit for the work done in this post, I will say that that experience fueled it.  So as you read through this, bear in mind that I'm experienced, and have a pretty good idea of what to do to get myself out of trouble when android mods go sideways.  Yes, I've bricked a few devices, rendering them useless, but that's been few and far between.