With the release of Ubuntu 24.10 and subsequently Ubuntu 25.04, the lastlog command has been removed.
Running lastlog results in a straight command not found error from the shell. Checking on an older system, dpkg -S /usr/bin/last and /usr/bin/lastlog come from packages util-linux and login respectively.
We can view the change log with apt-get changelog login or apt-get changelog util-linux, which shows a deliberate move away from these commands.
The suggestion is to install wtmpdb, which restores last. It’s a shame as it was helpful that lastlog was always available so you could see if a machine had been used recently without needing to install wtmpdb.