Akregator is a free and open source rss and atom feed reader application for Linux. It comes with notify you of unread feeds, build-in browser, option to open feed url in external browser, archive the feed, limit archive, set delete articles older than custom date, option to load full website, you can set the custom feed update interval and mark articles as read when they arrive, import and export feeds and lot more.
How to Install Akregator on UBuntu Linux
Akregator is available as a flatpak package from flathub. You need to install flatpak on your system first. And restart your system after the installation. Follow this link for installation instructions.
Open the terminal software (ctrl+alt+t) and run below command to install the latest version of Akregator Feed Reader on your system.
flatpak install flathub org.kde.akregator
After that open it using below command or also via the application menu.
flatpak run org.kde.akregator
And uninstall it using this command.
sudo flatpak uninstall org.kde.akregator