Now I managed to boot from USB and can get to the live-desktop. With disabled graphics or 'nomodeset' I even got to the partition table, and it even started installing, but so slowly, it probably would have taken 8 hours. Through my experiments it seems clear that it doesn't have to do with the DVD/CD drive, because I can reproduce the problem with USB as well. I tried it again and it stopped if I check 'third party software' and it often stops after the partition table. With nomodeset I managed a full installation, but then I had no keyboard or mouse. I read a lot of errors about 'irq handler vector'. Does that mean anything? One installation worked but the the computer was incredibly slow,
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