- 1.28.6-2~22.04 isn't a right version for an upload upload, that would be one to use for a SRU of 1.28.6-2 from Debian done to Ubuntu but there is no Debian revision you are based on there. The correct version is 1.28.6.2ubuntu1
- the correct target is 'impish' not 'experimental'
Thanks, some review notes about the changelog
- 1.28.6-2~22.04 isn't a right version for an upload upload, that would be one to use for a SRU of 1.28.6-2 from Debian done to Ubuntu but there is no Debian revision you are based on there. The correct version is 1.28.6.2ubuntu1
- the correct target is 'impish' not 'experimental'
- the changelog should include the bug reference
I've fixed those issues and uploaded