Thank you for your reply.
To make it easier to find problems, I re-established an environment, and then executed the following commands in order:
python3 -m venv ~/env_test/aiida-vasp
source ~/env_test/aiida-vasp/bin/activate
pip install aiida-core
verdi quicksetup
Now execute “verdi status” to check aiida is all normal. Next install the plugin (in the active environment),
(aiida-vasp) ****@ubuntu:~/Desktop$ pip install aiida-vasp
all the lines start with "Requirement already satisfied: ......", shows that this plugin already installed.
But when I execute "verdi plugin list aiida.groups" to check, there is still no aiida-vasp related content in the output. It seems this plugin has not been successfully installed.
Best wishes,
Lei