Just ran into this issue on with a Focal host mirroring Focal repositories with Focal clients. Some searching led me to https://github.com/Stifler6996/apt-mirror which I can confirm works (i.e. fixes cnf, icons, and compression-related problems).
I don't know the politics behind how maintainers get chosen but I'm happy to help however I can.
Just ran into this issue on with a Focal host mirroring Focal repositories with Focal clients. Some searching led me to https:/ /github. com/Stifler6996 /apt-mirror which I can confirm works (i.e. fixes cnf, icons, and compression-related problems).
I don't know the politics behind how maintainers get chosen but I'm happy to help however I can.