Please welcome OnlyOffice Desktop, a free office suite (GNU AGPL) with beautiful interface and support for both LibreOffice & Microsoft document formats, available for GNU/Linux. It has word processor, spreadsheet, and presentation programs. The source code is available at GitHub and it also has a server version. OnlyOffice is a free software by Ascensio System. This article shows how to download & install OnlyOffice Desktop on Ubuntu
Download OnlyOffice Desktop
OnlyOffice Desktop for Ubuntu is available at GitHub https://github.com/ONLYOFFICE/DesktopEditors/releases. Save the .deb file into your $HOME folder. See picture below.
Use DPKG to Install
Open your Terminal (Ctrl+Alt+T) and type command below. For Ubuntu 16.10 and 17.04, it must produces errors (missing dependencies) and that's normal.
Use APT to Finish Install
Still on Terminal, type command below when internet connection is still on. This will automatically download the missing dependencies for your Ubuntu system. Performing this should completely install OnlyOffice, if it's not, just repeat DPKG command before.
Run OnlyOffice Desktop
Open your desktop menu and type "desktop editors". The blue-green-red stack icon is the OnlyOffice program. Happy working!