Okay, I've one more idea. When the release upgrade process runs it creates a backup of the sources.list file (/etc/apt/sources.list.distUpgrade). Could you compare the "restored" /etc/apt/sources.list file to the contents of /etc/apt/sources.list.distUpgrade? I'd like to see a diff of the two files. Thanks!
Okay, I've one more idea. When the release upgrade process runs it creates a backup of the sources.list file (/etc/apt/ sources. list.distUpgrad e). Could you compare the "restored" /etc/apt/ sources. list file to the contents of /etc/apt/ sources. list.distUpgrad e? I'd like to see a diff of the two files. Thanks!