I had the same symptoms than the ones reported above by Janne and Raquel for a 
Xubuntu 22.04 Live DVD:
- I first checked the iso file (checksum ok) => I got "Failed to start Ubuntu 
Live CD installer" after ~15 minutes, then again after ~15 minutes more I got 
an almost frozen install Desktop with no way to continue + DVD very buzy 
- I used another DVD => failed again
- I used boot option "nomodeset" => failed again 
- I finally used boot option "fsck.mode=skip" => then the installation has 
started and was successful
Many thanks for the trick.

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https://bugs.launchpad.net/bugs/1930880

Title:
  Booting Ubuntu 21.04 from DVD takes more than 30 minutes and its
  environment are corrupted

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