How to set up SSH remote access on Pop!_OS?

To set up SSH remote access on Pop!_OS, follow these steps:

Install OpenSSH Server: If it's not already installed, you can do so by opening a terminal and running:
```
sudo apt update
sudo apt install openssh-server
```
Verify SSH Service: Ensure that the SSH service is running and enabled to start on boot:
```
sudo systemctl status ssh
sudo systemctl enable ssh
sudo systemctl start ssh
```
Configure Firewall: Allow SSH traffic through the firewall if it's active. For UFW (Uncomplicated Firewall), use:
```
sudo ufw allow ssh
sudo ufw enable
```
Get Your IP Address: Find out your Pop!_OS machine's IP address, which you'll need to connect from another device:
```
ip addr show
```
Look for an entry like inet under your network interface (e.g., eth0 or wlan0).
Connect via SSH: From another computer, open a terminal and use the SSH command to connect:
```
ssh username@ip_address
```
Replace username with your actual username on the Pop!_OS machine and ip_address with the IP address you found.
Secure Your SSH (Optional but Recommended): For enhanced security, consider editing the SSH configuration file (/etc/ssh/sshd_config) to disable root login and use key-based authentication instead of passwords.

Example of a secure SSH setup:

Edit the SSH configuration file:
```
sudo nano /etc/ssh/sshd_config
```

Change or add the following lines:

PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes

Restart the SSH service to apply changes:
```
sudo systemctl restart ssh
```

For managing SSH keys and further securing your cloud-based Pop!_OS instance, consider using services like Tencent Cloud's CloudHSM (Hardware Security Module) for key management and encryption needs.