pamu2fcfg fails to run, missing getlogin

[Kenneth Finnegan]

Trying to run the pamu2fcfg tool (1.0.4-2) to pair a U2F token to my Raspberry Pi, it returns with the error message "getlogin: No such file or directory"

pi@u2fdemo:~ $ sudo apt install pamu2fcfg
[SNIP]
pi@u2fdemo:~ $ pamu2fcfg -d
getlogin: No such file or directory
pi@u2fdemo:~ $

It seems this package is lacking some dependency to pull in the getlogin command.

[Nikita Koval (nikodll)]

Can reproduce the bug on [classic] bionic where LDAP authentication is used, but on 18.10 everything works flawlessly with standard user auth.

[Nikita Koval (nikodll)]

Additional info:
On bionic + LDAP (where I can reproduce the bug) the "logname" command returns:
> logname: no login name
on 18.10 (where I cannot reproduce it) the "logname" command returns my username. So I don't think the problem is with dependencies, but rather some specifics of how login name is retrieved for different authentication types.