Unable to run sudo after upgrading Ubuntu server 14.04 to 16.04
by linuxsuser from LinuxQuestions.org on (#4R1W6)
The Ubuntu server 14.04 was upgraded using "sudo do-release-upgrade' to 16.04. Then I cannot run sudo at all. The weird thing is that I can log in with "sysadmin", but get the error when trying sudo with "sysadmin"
sudo: policy plugin failed session initialization
sysadmin@XXX:~$
login as: sysadmin
sysadmin@XXX's password:
Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-164-generic x86_64)
Documentation: https://help.ubuntu.com
Management: https://landscape.canonical.com
Support: https://ubuntu.com/advantage
System information as of Tue Sep 24 14:42:14 XXX 2019
System load: 0.17 Processes: 121 Usage of /: 14.2% of 35.07GB Users logged in: 0 Memory usage: 10% IP address for eth0: XXX Swap usage: 0%
Graph this data and manage this system at: https://landscape.canonical.com/
Last login: Tue Sep 24 14:31:33 2019 from XXX
sysadmin@XXX:~$ sudo su
[sudo] password for sysadmin:
sudo: policy plugin failed session initialization
sysadmin@XXX:~$
sudo: policy plugin failed session initialization
sysadmin@XXX:~$
login as: sysadmin
sysadmin@XXX's password:
Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-164-generic x86_64)
Documentation: https://help.ubuntu.com
Management: https://landscape.canonical.com
Support: https://ubuntu.com/advantage
System information as of Tue Sep 24 14:42:14 XXX 2019
System load: 0.17 Processes: 121 Usage of /: 14.2% of 35.07GB Users logged in: 0 Memory usage: 10% IP address for eth0: XXX Swap usage: 0%
Graph this data and manage this system at: https://landscape.canonical.com/
Last login: Tue Sep 24 14:31:33 2019 from XXX
sysadmin@XXX:~$ sudo su
[sudo] password for sysadmin:
sudo: policy plugin failed session initialization
sysadmin@XXX:~$