I've found with both machines that, once powered down, I cannot log in at the system console (laptop user interface) following subsequent reboots. SSH and VNC sessions work as expected. Console login attempts are not rejected as though an invalid password were entered. Rather, the screen simply goes blank for a second or two following password entry, then returns to the login prompt. The output of /var/log/auth.log isn't much help:
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May 4 14:07:06 stith gdm-password]: gkr-pam: unable to locate daemon control file
May 4 14:07:06 stith gdm-password]: gkr-pam: stashed password to try later in open session
May 4 14:07:06 stith gdm-password]: pam_unix(gdm-password:session): session opened for user mrtime by (uid=0)
May 4 14:07:06 stith systemd-logind[684]: New session 21 of user mrtime.
May 4 14:07:06 stith gdm-password]: gkr-pam: unlocked login keyring
May 4 14:07:08 stith gdm-password]: pam_unix(gdm-password:session): session closed for user mrtime
May 4 14:07:08 stith systemd-logind[684]: Session 21 logged out. Waiting for processes to exit.
May 4 14:07:08 stith systemd-logind[684]: Removed session 21.
As a test, I created another account which is empty save for a minimal .profile. I can log into that account from the console without problems, which implies that the issue is probably within my primary account configuration.
I've installed and configured three or four similar systems recently using Ubuntu 20.04 LTS and not encountered similar issues. If necessary, I can start over from scratch and do the same with the two Mint machines. Time is short before these systems need to go into service, however, so if I could resolve this one issue it would be much preferred.
Any pointers would be most appreciated.