How to Install SeaMonkey on Linux Mint 21 LTS

The SeaMonkey project was launched in 2005 to create a free, open-source Internet suite. It is based on the same source code as the former Mozilla Application Suite, which grew out of Netscape Communicator. SeaMonkey suite includes a browser, email and newsgroup client, IRC chat client, and simple HTML editor. All of your Internet needs can be met in one easy-to-use package. The SeaMonkey project is committed to delivering seamless integration of Internet applications, and it is continually evolving to meet the changing needs of its users. If you’re looking for an all-in-one solution for your Internet needs, SeaMonkey is the answer.

In the following tutorial, you will learn how to install SeaMonkey on Linux Mint 21 LTS desktop with the official Ubuntuzilla Repository APT repository using the command line terminal and instructions on updating and removing the software in the future if required.

Update Linux Mint

First, update your system to ensure all existing packages are up to date to avoid conflicts.

sudo apt update && sudo apt upgrade

Install SeaMonkey

The first and easiest method is to install SeaMonkey using the source APT repository.

First, install the required packages.

sudo apt install dirmngr ca-certificates software-properties-common gnupg gnupg2 apt-transport-https -y

Next, import the GPG key required to verify the authenticity of the packages as follows. If you have issues importing the GPG key, please see the end section on GPG troubleshooting at the end of the article.

sudo gpg --no-default-keyring --keyring /usr/share/keyrings/ubuntuzilla.gpg --keyserver --recv-keys 2667CA5C

Example output:

ngs/ubuntuzilla.gpg --keyserver --recv-keys 2667CA5C
gpg: key B7B9C16F2667CA5C: public key "Daniel Folkinshteyn (Ubuntuzilla signing key) <>" imported
gpg: Total number processed: 1
gpg:               imported: 1

Now import the APT repository using the following command.

printf 'deb [signed-by=/usr/share/keyrings/ubuntuzilla.gpg] all main\n' | sudo tee /etc/apt/sources.list.d/ubuntuzilla.list >/dev/null

Run a quick APT update to reflect the newly added APT source.

sudo apt update

Lastly, install SeaMonkey using the following command.

sudo apt install seamonkey-mozilla-build

How to Launch SeaMonkey

Now, the best method to launch SeaMonkey Internet Suite is using the application icon.

Taskbar > Show Applications > Mozilla Build of SeaMonkey


How to Install SeaMonkey Linux Mint 21 LTS

Alternatively, you may want to use it for applications quite frequently. Right-click the icon and add it to favorites, making the icons appear on the taskbar.

Once you open the suite, you will be prompted to set SeaMonkey as the default client for various items such as browser, email, newsgroups, etc.


How to Install SeaMonkey Linux Mint 21 LTS

Congratulations, you have learned how to install SeaMonkey.

How to Install SeaMonkey Linux Mint 21 LTS

How to Update/Upgrade SeaMonkey

Next are the commands to run in your terminal to check for updates. These commands will blanket-check all installed packages on your system that match the installation package manager. Ideally, you should run this regardless, even if auto-updates are set up to ensure your system is up-to-date and no update errors occur for newer users.

sudo apt update && sudo apt upgrade

How to Remove (Uninstall) SeaMonkey

First, remove the internet suite using the following command for users that no longer wish to have SeaMonkey installed.

sudo apt install seamonkey-mozilla-build --purge

Users that will no longer require the APT import repository since you will not use it again can safely remove it, which is good housekeeping and security best practices.

sudo rm /etc/apt/sources.list.d/ubuntuzilla.list

Optionally, you can remove the GPG as well with the following command.

sudo rm /usr/share/keyrings/ubuntuzilla.gpg

How to Fix Broken LaunchPAD PPA GPG Key Import

For users who have not previously imported a GPG key from the Ubuntu keyserver, the command line terminal will often have issues importing GPG keys from LaunchPAD PPAs because the directories are not created. This is an easy fix. Use the following command that will, in turn, generate the directories.

sudo gpg --list-keys

Example output:

As mentioned above, the necessary directories have been created. This can be skipped, and use the following GPG import command below. If you have any issues with directories missing for this and any other PPA GPG key in the future, just run the above command.

Comments and Conclusion

SeaMonkey is an excellent option for a free, open-source internet suite. It includes many features not available in other suites, such as an HTML editor and an RSS reader. If you’re looking for an alternative to the big names out there, give SeaMonkey a try!

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