The problem comes from this error
[ 2641.114805] EXT4-fs (sda1): Remounting filesystem read-only
The filesystem got remounted read-only following a disk error, which is
not an installer bug. You should probably check your hard-drive
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
Thanks for taking the time to report this bug and helping to make Ubuntu
better. We appreciate the difficulties you are facing, but this appears
to be a "regular" (non-security) bug. I have unmarked it as a security
issue since this bug does not show evidence of allowing attackers to
cross privile
