Behaviour in 20.04 was like it is in 22.04: Once I went through the dialog and created one no-system user, the login screen shows all accounts not listed as "system". I.e. all of our LDAP users (which are the only ones relevant to our users).
I manually marked those accounts as system, to have them excluded from the login list.
The link you posted is about disabling the user list altogether, which is not what we we want. We want to have the user list but have it show only standard, no-special users.
Behaviour in 20.04 was like it is in 22.04: Once I went through the dialog and created one no-system user, the login screen shows all accounts not listed as "system". I.e. all of our LDAP users (which are the only ones relevant to our users).
I manually marked those accounts as system, to have them excluded from the login list.
The link you posted is about disabling the user list altogether, which is not what we we want. We want to have the user list but have it show only standard, no-special users.