I'm following instructions on the following page to the letter: https://ubuntu.com/download/kvm . When I run the kvm command, the VM screen appears containing the following error:
error: no such device: ubuntu-boot,
then GRUB screen shows, then (after choosing the default Install option) a blank screen with:
error: invalid signature. Press any key to continue...
Then it returns to GRUB screen again. No options get me anywhere.
The sha256sum output of compressed image verifies with one provided on the page. Unfortunately, no checksum for uncompressed image is provided, so I'm unable to verify it (BTW, it is c8472b8fbeb72f677733606e77c4a87ac7937919b66be614abc42166cbae77c9). But I tried two different host systems (18.04, 20.04) and two decompressors (unxz, pixz), all with the same result. I also tried replacing
qemu-system-x86_64, nothing changes.
-L helpshows three options, but neither of them changes much.