This tutorial will guide you through installation of OnlyOffice version 7 and later on Ubuntu Desktop. OnlyOffice is a GNU AGPL licensed, alternative to LibreOffice and Microsoft Office, which is full featured, beautiful looking and cross-platform. We will install it on Ubuntu 22.04 "Jammy Jellyfish" on this exercise. 

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Requirements:

• Internet access on Ubuntu computer. 
• Minimum 1GB free disk space.

(OnlyOffice Spreadsheet)

Steps to install: 

Step 1. Run Ubuntu Software. 

Step 2. Wait until it finished updating to display choices of applications. 

Step 3. Search 'onlyoffice'.

Step 4. Select onlyoffice-desktopeditors from search results and its page will be displayed.

Step 5. Click Install.

(Installation process of OnlyOffice on Ubuntu 22.04)

Step 6. Wait for the process to finish.

Step 7. OnlyOffice installed. 

Step 8. Run OnlyOffice from the Applications Menu.

(OnlyOffice Presentation)

Notes: it seems that OnlyOffice brings nonfree fonts (=fonts which are equal to proprietary software) like Arial, Calibri and Comic Sans and made them as default.