I restarted my Librem 15, because I was asked to install an OS update. After installation and another reboot I entered the cryptsetup password sucessfully and PureOs does not started up. See attached picture.
How to fix that? 
Try with this: https://tracker.pureos.net/w/troubleshooting/broken_upgrade/
Yep, fixed the startup problem. But still this Upgrade of Purebrowser fails