Mmh, so it always fails with 20190926, and it always succeeds with 20190926.1. Strange. If the problem is not reproducible with the newer images we're probably not going to spend a lot of time here, but the case is definitely curious.
I know that file corruption is improbable in this case, but maybe it's worth checking. Does the hash of your 20190926 ISO image match those in [1]?
Mmh, so it always fails with 20190926, and it always succeeds with 20190926.1. Strange. If the problem is not reproducible with the newer images we're probably not going to spend a lot of time here, but the case is definitely curious.
I know that file corruption is improbable in this case, but maybe it's worth checking. Does the hash of your 20190926 ISO image match those in [1]?
Thanks!
Paride
[1] http:// cdimage. ubuntu. com/ubuntu- server/ daily/20190926/