I detected the problem, due to a hardware error, which has been handled extremely badly.
I will explain it very simple: I have a normal network connection with my local network, but the connection to the Internet is missing. Ubuntu boots, but after login the system gets into a loop and only displays a purple or black screen. I did get the system out off the loop by disconnecting its Ethernet cable. This has been my solution till the cable had been repaired. Note that the solution only works for the HOST OS, my Ubuntu VBox VMs had the same problem and looped after login. Like I said the Windows VMs and the Fedora VM did not have that problem, because they handled this Internet missing issue correctly. As ex-OS designer, I solved many issues based on this type of information! I not familiar with the internal design of Linux, but I expect that Ubuntu tries to connect to the Internet after login for e.g livepatch or for a DNS server. In both cases the connection will fail and it looks like Ubuntu keeps trying in an endless loop, while blocking the desktop display function. I think the sh.desktop failing is the problem and it only got resolved after I pulled the Ethernet plug. I guess that sh.desktop needs an Internet function, that is not available. It returns an error and Ubuntu keeps trying for ever. If I pull the Ethernet plug, Ubuntu realizes, that it has to start anyhow. This is my last reaction to my bug-report, solve it or not. I don't care. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1908012 Title: System did not boot anymore after broken cable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bind9/+bug/1908012/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
