Managing Users and Hostname on Ubuntu Server

To change the hostname of your system:

Edit the hostname file:
bash 复制代码
```
sudo nano /etc/hostname
```
Replace the existing name with your new hostname.
Edit the hosts file:
bash 复制代码
```
sudo nano /etc/hosts
```
Update the line that starts with 127.0.1.1 to reflect the new hostname.

Apply the changes:

bash 复制代码

sudo systemctl restart systemd-logind.service

To rename a user:

Rename the user:

bash 复制代码

sudo usermod -l new_username old_username

Rename the home directory (if needed):
bash 复制代码
```
sudo usermod -d /homes/new_username -m new_username
```

To add a user to the sudo group:

bash 复制代码

sudo usermod -aG sudo username

To add a new user with a home directory in /homes:

Create the directory (if it doesn't exist):
bash 复制代码
```
sudo mkdir -p /homes
```

Add the user:

bash 复制代码

sudo useradd -m -d /homes/new_user -s /bin/bash new_user

Ensure home directories are secure:

Set ownership:

bash 复制代码

sudo chown new_user:new_user /homes/new_user

If you have any more questions or need further assistance, feel free to ask!