How to Install and Use the Termius Client on Linux

Install Termius on Linux from the official .deb download, configure an SSH host, and connect from the app’s Hosts screen. For file transfers between this computer and a server, choose the website download: Termius says its Snap build is sandboxed and cannot access local storage in SFTP or provide the local terminal.

Install Termius on Linux

Termius offers an official Linux .deb and Snap package. The website build provides fuller desktop features; its installation guide says to download the DEB and follow the installer prompts.

1. Download the DEB package. On the official Linux page, choose Download .DEB. Use it on Debian, Ubuntu, or another system that supports DEB packages.



2. Install it. Open the downloaded file and confirm installation in your desktop package installer. On Ubuntu or Debian, you can also install from the Downloads folder in Terminal: sudo apt install ./termius*.deb. Check that the filename matches if you have more than one Termius package in that folder.



3. Open Termius. Find it in your application menu and launch it.



4. Sign in or create an account. Use an account if you want Termius data synced across devices.

If you use Snap, install the verified Termius package with sudo snap install termius-app. It supports remote SSH, but sandboxing blocks local SFTP storage and the local terminal. Choose the website DEB on a compatible system for those features.

Add an SSH host

Before you begin, get the server address, SSH port, username, and authentication method from your provider or administrator. The server must already be running SSH and reachable from your network.

4. Create a host entry. In Termius, open Vault, go to Hosts, and select New Host. Enter a short label such as web-server so you can recognize the machine later.



5. Enter connection details. Set Address to the server IP or DNS name, Port to the supplied port (usually 22), and Username to your server account. The pictured address is a placeholder.



6. Choose authentication. Use your server account password if enabled, or select an SSH key authorized on the server. To add a key, open the credential section, choose the key option, and import or paste your private key. Keep private keys secret. There is no universal default password. See Termius’s connection guide for password and key setup.
7. Connect and verify the server. Select Connect or open the saved host. On a first SSH connection, compare the server’s displayed host-key fingerprint with a trusted value from your administrator or provider before accepting it. If a known server’s fingerprint changes unexpectedly, stop and investigate. The OpenBSD OpenSSH manual explains first-connection host-key verification.

After authentication, Termius opens a terminal for the remote account. Reopen the saved host later to connect again without retyping its address.

Transfer files with SFTP

8. Open SFTP. Select SFTP; the local file system opens in one pane. Choose your saved server in the other and browse to the destination. You do not need a separate localhost host entry.

To upload, open the server’s target folder and drag a local file into that pane, or right-click it and choose Copy to target directory. For downloads, copy or drag a remote file to the local pane. Check the destination, then refresh if needed. See Termius’s SFTP guide.

Fix common connection problems

• Connection timed out or refused: confirm the address and port, check that the server is online, and ask whether its firewall or cloud security group allows SSH from your network.
• Permission denied: check the username and authentication choice. For key login, make sure the matching public key is installed for that account on the server; password login may be disabled by the administrator.
• No local files appear in SFTP: this is expected with the Snap package’s file-system restrictions. Install the website DEB build on a compatible distribution for local file access.

A saved host gives you a reusable SSH terminal, and SFTP provides a two-pane file-transfer workflow.