Unknown operation st-CodePudding

I ran into the following line while setting up the server in ubuntu. When logging in or accessing as root, the following message is displayed as a warning. Do you know how to get rid of this phenomenon?

root@ubuntu:~# sudo -i
Unknown operation st.
root@ubuntu:~#

ssh connection

Last login: Thu Jan 13 12:16:33 2022 from 
Unknown operation st.
root@ubuntu:~#

CodePudding user response：

Maybe it's an issue occurs while your shell sourcing.

Try checking your ~/.bashrc file or any other shell config files(/etc/profile, ~/bash_profile, ~/.profile etc)