apport was the name of the package, it includes a number of commands (including
ubuntu-bug) but none just named
apport-bug apport-cli apport-collect apport-unpack
I got that to appear by pressing TABTAB rather than hitting enter after typing
apport (the first TAB autocompleted by adding the
- and second gave me a list of available commands).
Your install is much older than mine, and those of us who like to tinker, experiment or enjoy our systems often make temporary changes we can forget about.
This install of mine was made using the mantic daily ISO dated 20230829 yet I didn't [then] recall why or when I experimented with au. & main archive which I only noticed in output I used in prior comment; its easy to make a change & forget what prompted our action.