shadow is indeed a reserved username as I found in the ubiquity-1.6.8/d-i/source/user-setup/reserved-usernames file - so that is probably the cause of the bug. However, I would have expected ubiquity to raise an error.
shadow is indeed a reserved username as I found in the ubiquity- 1.6.8/d- i/source/ user-setup/ reserved- usernames file - so that is probably the cause of the bug. However, I would have expected ubiquity to raise an error.