If you’re unable to log in with the user Alvin, there could be several potential issues preventing successful login. Here are some steps you can take to troubleshoot and fix the issue:
1. Verify User Existence
First, confirm that the user Alvin exists on the system:
grep Alvin /etc/passwd
If the user exists, you should see an entry similar to this:
Alvin:x:1001:1001:Alvin:/home/Alvin:/bin/bash
If no output is returned, the user might not have been created successfully. You can create the user again using:
sudo useradd -m Alvin
sudo passwd Alvin
This will create the user Alvin, set the home directory, and allow you to set a password.