Boot daily on d755-5 or box that has been having this issue.
BIOS, no encryption, manual partitioning, internet
Install to replace existing Lubuntu 20.04 with new daily image.
Selected SDA8 - was /home before and will be again, no-format
Selected SDA9 - was / for lubuntu 20.04 before, this had to be selected as new partition 'reiserfs' so I get 'format' to stick, on clicking OK I'd re-enter and change back to 'ext4'
If I select 'format' and let it remain ext4, on re-entry into the area (for validation of entry) it'll be tagged 'keep'. As far as I recall it fails with same issue on keep, but I'm selecting format being what I entered in iso.qa.ubuntu.com as purpose of install.
Boot daily on d755-5 or box that has been having this issue.
BIOS, no encryption, manual partitioning, internet
Install to replace existing Lubuntu 20.04 with new daily image.
Selected SDA8 - was /home before and will be again, no-format
Selected SDA9 - was / for lubuntu 20.04 before, this had to be selected as new partition 'reiserfs' so I get 'format' to stick, on clicking OK I'd re-enter and change back to 'ext4'
If I select 'format' and let it remain ext4, on re-entry into the area (for validation of entry) it'll be tagged 'keep'. As far as I recall it fails with same issue on keep, but I'm selecting format being what I entered in iso.qa.ubuntu.com as purpose of install.