One of the systems was using package linux-generic and in practice
Linux pedabackup 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/version_signature Ubuntu 5.4.0-80.90-generic 5.4.124
One of the systems was using package linux-generic and in practice
Linux pedabackup 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/version_ signature
Ubuntu 5.4.0-80.90-generic 5.4.124