How to Install OnlyOffice 6.3 on Your Linux PC

If you want a Linux office suite that feels a little more familiar to Microsoft Office users and a little less like a scavenger hunt through menus, ONLYOFFICE 6.3 is a solid pick. It brought practical upgrades like a dark theme, 150% interface scaling, better reviewing tools, and several spreadsheet improvements. In plain English: it got easier on your eyes, easier on high-DPI displays, and friendlier for real work.

There is one tiny-but-important wrinkle before we dive in. When people say OnlyOffice 6.3 for Linux, they usually mean ONLYOFFICE Desktop Editors 6.3.1, the desktop build that carried the 6.3 feature set. If you install ONLYOFFICE from a current repository, Snap, or Flatpak today, you will usually get a newer version instead of the old 6.3 build. So, if your goal is exactly version 6.3, the safest route is installing the archived .deb or .rpm package for 6.3.1.

Why Install ONLYOFFICE 6.3 on Linux?

Some people want the newest version of everything. Others want the version that actually matches a tutorial, a workplace standard, or an older setup they already trust. If you are in the second camp, welcome. We have snacks.

ONLYOFFICE 6.3 is worth installing on Linux for a few simple reasons:

• It offers a familiar ribbon-style interface that feels comfortable to many former Microsoft Office users.
• It works well with common Office file formats like DOCX, XLSX, and PPTX.
• It added a dark theme and 150% scaling, which made the desktop app much nicer on modern displays.
• It improved document review tools, which is useful if you edit shared drafts instead of merely pretending to.
• It is a desktop app, so you can work with local files without living in a browser tab all day.

Before You Install ONLYOFFICE 6.3

Before touching the terminal, check a few basics. ONLYOFFICE Desktop Editors on Linux are built for 64-bit systems. If you are using a very old machine or an unusual setup, that matters. The app also needs administrative permissions for installation.

Recommended Minimums

• Dual-core 2 GHz processor or better
• 2 GB RAM or more
• At least 2 GB of free disk space
• 64-bit Debian, Ubuntu, Red Hat, CentOS, or a compatible Linux distribution

If your PC barely breathes when you open a browser and a PDF at the same time, clean up some space first. Installing office software on a machine that is already gasping is a bold strategy, but not always a winning one.

The Best Way to Install the Exact 6.3 Version

If your goal is the exact 6.3 release, do not start with the live repository, Snap, or Flatpak. Those methods are great when you want the latest version. They are not great when you specifically want a build from 2021.

Instead, download the archived ONLYOFFICE Desktop Editors 6.3.1 package that matches your Linux family:

• .deb for Ubuntu, Debian, Linux Mint, Pop!_OS, and similar distributions
• .rpm for Fedora, RHEL, CentOS, Rocky Linux, AlmaLinux, and similar distributions

Once you have the correct package file, installation is straightforward.

How to Install ONLYOFFICE 6.3 on Ubuntu, Debian, Linux Mint, and Similar Distros

If your system uses DEB packages, move the downloaded 6.3.1 file into your Downloads folder or any convenient directory. Then open Terminal and run one of the following methods.

Method 1: Install the DEB Package with APT

This is the cleanest option because apt is better at handling dependencies than the old “install now, cry later” approach.

Method 2: Use DPKG, Then Fix Dependencies

This method still works well and is handy if you are following older Linux tutorials. The second command repairs missing dependencies if the first command throws a fit.

Launch ONLYOFFICE After Installation

You can also open it from your applications menu under Office or by searching for ONLYOFFICE.

How to Remove It Later

If you want to remove the app and its configuration files:

How to Install ONLYOFFICE 6.3 on Fedora, RHEL, CentOS, Rocky, and Similar Distros

If your Linux distribution uses RPM packages, download the archived 6.3.1 RPM build and install it with your package manager.

Using DNF

Using YUM

After installation, launch the program with:

How to Uninstall It

On newer Fedora-style systems, dnf remove onlyoffice-desktopeditors works too.

If You Do Not Need the Exact 6.3 Version

Let’s say you searched for “How to install OnlyOffice 6.3 on Linux,” but after five minutes of reading, you realize what you really want is “How do I install ONLYOFFICE without making this harder than necessary?” Fair enough. Here are the easiest modern methods. Just remember: these usually install the current build, not 6.3 specifically.

Install from the Official Repository on Debian or Ubuntu

Install via Snap

Run it with:

Install via Flatpak

Run via AppImage

AppImage is perfect when you want portability and minimal commitment. It is the Linux equivalent of saying, “I’m not moving in, I’m just staying over.”

How to Confirm the Installation Worked

Once ONLYOFFICE opens, do a quick sanity check:

1. Open a DOCX file and make sure the interface loads correctly.
2. Open an XLSX spreadsheet and test a simple formula.
3. Open a PPTX file and make sure slides render cleanly.
4. Visit the app’s About section and confirm the version reads 6.3.1 if you installed the archived 6.3 release.
5. Optional but satisfying: switch to dark mode and admire your good life choices.

Common Problems and Easy Fixes

Problem: Wrong Version Installed

If you used Snap, Flatpak, or the live repository, you probably installed a newer release. That is not a bug. That is those systems doing exactly what they were built to do. To get 6.3 specifically, uninstall the newer build and use the archived DEB or RPM package.

Problem: Dependency Errors on Debian or Ubuntu

Use:

This usually pulls in the missing pieces and finishes the job.

Problem: The App Will Not Launch

Try launching it from Terminal:

If an error appears, read it carefully. Yes, actually read it. Linux error messages often look rude, but they are often telling the truth.

Problem: Your System Is 32-bit

ONLYOFFICE Desktop Editors for Linux are intended for 64-bit systems. If your distro is 32-bit, this install is going nowhere fast.

Problem: Visual Scaling Looks Weird

One nice thing about version 6.3 is that it introduced 150% scaling. If the app looks tiny on a high-resolution display, check the app settings and your desktop environment scaling options.

Tips for a Better ONLYOFFICE Setup on Linux

Installing the software is the easy part. Making it pleasant to use every day is where the real magic happens.

• Pin ONLYOFFICE to your dock or taskbar if you use it often.
• Set it as the default app for DOCX, XLSX, and PPTX files if you want one-click convenience.
• Test a few real documents, not just blank files, especially if you care about formatting fidelity.
• If you collaborate online, connect the desktop app to your preferred cloud platform after installation.
• Keep a backup of the 6.3.1 installer if you need this exact version for repeat deployments.

Real-World Experiences Installing ONLYOFFICE 6.3 on Linux

Installing ONLYOFFICE 6.3 on Linux is one of those jobs that sounds dramatic until you actually do it. Then it turns into a very normal sequence of downloading the right file, typing a few commands, and wondering why you mentally prepared for a week-long odyssey through dependency hell. In real life, the biggest challenge usually is not the installation itself. It is choosing the correct installation method.

A lot of Linux users start with Snap or Flatpak because those methods are fast and familiar. That is perfectly reasonable, especially on a personal machine where “latest stable version” is what you want. But if your goal is a specific historical release like ONLYOFFICE 6.3, that convenience can backfire. You think you are recreating an older environment, and five minutes later you are staring at a much newer interface. That is why experienced Linux users tend to slow down for a second, confirm the version number they actually need, and then pick the package method that matches that goal.

On Ubuntu-based systems, the DEB route usually feels the most natural. It fits nicely into the usual APT workflow, dependency repair is simple, and launching the app afterward feels seamless. On RPM-based systems, DNF or YUM does the same job just as well. The experience is not flashy, but it is reliable, and reliable beats flashy every single time when you are setting up productivity software.

Another real-world lesson is that version-specific installs are often less about technical difficulty and more about discipline. It is surprisingly easy to grab the first download button you see and accidentally install the newest build. If you are working from a compatibility checklist, reproducing an old workstation, or following documentation written around the 6.3 release, that shortcut can create unnecessary confusion. The best installers are not the fastest typists. They are the people who verify the package name before pressing Enter.

There is also the usability side. Version 6.3 was a nice release for Linux desktop users because it made the app feel more polished in everyday use. Dark theme support is not just cosmetic; it makes long editing sessions more comfortable. The 150% scaling option is equally practical, especially on displays where 100% is too tiny and 200% looks like your interface got attacked by a zoom ray. That middle ground matters more than it sounds.

Finally, the best experience usually comes after installation, not during it. Once ONLYOFFICE is running, open a real document, test formatting, try a spreadsheet, and make sure the version number is what you expected. If everything works, save the installer, note the commands you used, and give yourself credit. You installed a version-specific office suite on Linux without turning your terminal into a haunted house. That counts as a good day.

Final Thoughts

If you want the exact version of ONLYOFFICE 6.3 on your Linux PC, use the archived 6.3.1 DEB or RPM package. That is the cleanest and most predictable approach. If you just want ONLYOFFICE on Linux and do not care about the old version number, the official repository, Snap, Flatpak, and AppImage methods are faster and easier.

Either way, the result is a capable Linux office suite with strong document compatibility, a familiar interface, and enough polish to keep your workflow moving. And really, that is what you want from office software: fewer surprises, fewer formatting disasters, and fewer moments where a spreadsheet decides to become performance art.

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