I does appear that there is a mixed sources list from focal and bionic based on your post. Was this system upgraded at some point or is there another reason for this?
no. I’m mirroring packages from the Ubuntu mirror for specific releases by going through the Packages/Sources files and fetching the files listed there.
And by doing so it appeared that plib-doc_1.8.5.orig.tar.gz is listed in some Sources.gz files but doesn’t exist on the mirror.
So I would guess that the reference to the file should either be removed from the Sources.gz files or it should be present on the mirror.
No, that’s the .tar.xz
The file which is referenced but missing is the gzip archive plib-doc_1.8.5.orig.tar.gz
I’m looking on the archive.ubuntu.com mirror.
ohh… I see. Yeah, you’re right. The dists Sources file does list some source archives with .gz. I had thought that the conversion from gz to xz had been completed for Debian and Ubuntu, but apparently there’s a few(?) stragglers.
Based on this , I’m not sure I fully understand the problem and you would have to defer to another user for guidance. More information is needed about what specific releases. I did download the package linked by [steventhompson-2204] , extract and compress it as tar.gz ,but this does nothing to amend the source.