[Lilux-help] Ubuntu - unable to start desktop

Hello, I'm trying to install Ubuntu on an elderly PC (AMD Athlon 64 Dual Core 5200+), with onboard graphics. At first sight, everything looks fine, until I try to log in . After typing my password at the login screen, I get a flickering screen, with an error message popping up every couple of seconds. To be able to get the error, I had to take a picture of the screen with my mobile. Basically, the error says: " compiz crashed with SIGSEGV " This behaviour is the same regardless if I boot the installed system or if I use the "Try Ubuntu" without installing the system. Potential solutions found by googling refer to problems with some Intel graphics, so I guess they are not relevant. Or booting another kernel, but there is none. Etc. I have also tried the Ubuntu 18.04 LTS, which shows all the same behaviour. (I thought 18.04 might have too high requirements to the hardware, so I switched to an older version). Does anybody have an idea how to get around this? Regards, JJ Mouris