How to Install OnlyOffice on Ubuntu

OnlyOffice Desktop Editors is a free office suite for Ubuntu that edits local docx, xlsx, pptx, PDFs, and PDF forms without a browser tab. It is a common pick when you want Microsoft Office–friendly layout and formatting instead of—or alongside—LibreOffice on a Ubuntu Desktop machine.

This guide covers how to install OnlyOffice on Ubuntu from the official APT repository (the path Ascensio documents for Debian and Ubuntu), a direct .deb, Snap, and Flatpak. I ran the repository install on Ubuntu 25.04 and finished with 9.4.0-129 under /opt/onlyoffice. The install briefly stalled on ttf-mscorefonts-installer until dependencies were reconciled—you will see that fix below. This article is about Desktop Editors, not OnlyOffice Docs (the self-hosted collaboration server).

Quick command summary

Prerequisites

• sudo and outbound HTTPS to download.onlyoffice.com.
• A desktop session (GNOME, KDE, Xfce, etc.) if you want the GUI—Server images need a desktop stack first.
• Roughly 1.3 GB under /opt/onlyoffice after install, plus download cache during apt install.
• Optional: remove LibreOffice first when you only want one suite—the remove LibreOffice on Ubuntu guide covers purge and autoremove.

OnlyOffice is not in the default Ubuntu archive; you add Ascensio’s vendor repo or use Snap/Flatpak. The must-have Ubuntu apps roundup lists Snap as a quick path when you are still choosing an office stack.

• For broader CLI reference beyond the apt and sudo steps below, see the Linux commands.

See check Ubuntu version if you are unsure which release you are on.

Step 1: Add the official OnlyOffice APT repository

Ascensio publishes Desktop Editors in a Debian squeeze suite that also works on Ubuntu derivatives. Import the signing key and list file:

Ownership changes in this section use chown command syntax.

sudo apt-get install -y gnupg wget
mkdir -p -m 700 ~/.gnupg
gpg --no-default-keyring --keyring gnupg-ring:/tmp/onlyoffice.gpg \
  --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys CB2DE8E5
chmod 644 /tmp/onlyoffice.gpg

sudo chown root:root /tmp/onlyoffice.gpg
sudo mv /tmp/onlyoffice.gpg /usr/share/keyrings/onlyoffice.gpg
echo 'deb [signed-by=/usr/share/keyrings/onlyoffice.gpg] https://download.onlyoffice.com/repo/debian squeeze main' \
  | sudo tee /etc/apt/sources.list.d/onlyoffice.list
sudo apt-get update

On Ubuntu 25.04 the key import and apt update for OnlyOffice completed without errors. The key owner line looked like this:

gpg: key 8320CA65CB2DE8E5: public key "Ascensio System Limited (ONLYOFFICE) <support@onlyoffice.com>" imported

Confirm the candidate version before you install:

apt-cache policy onlyoffice-desktopeditors

onlyoffice-desktopeditors:
  Installed: (none)
  Candidate: 9.4.0-129
  Version table:
     9.4.0-129 500
        500 https://download.onlyoffice.com/repo/debian squeeze/main amd64 Packages

Step 2: Install OnlyOffice from APT

sudo apt-get install -y onlyoffice-desktopeditors

The package is large (about 348 MB in the apt cache on my host). Near the end of a successful run you should see:

Setting up gstreamer1.0-plugins-ugly:amd64 ...
Setting up gstreamer1.0-libav:amd64 ...
Setting up onlyoffice-desktopeditors (9.4.0-129) ...

Verify:

List files shipped by a package with dpkg -L; the dpkg command shows how to locate binaries and configuration paths.

dpkg -l onlyoffice-desktopeditors
desktopeditors --version

ii  onlyoffice-desktopeditors 9.4.0-129    amd64        Desktop editors for text ...
ONLYOFFICE ver. 9.4.0.129

The main binary is /usr/bin/desktopeditors (symlink to onlyoffice-desktopeditors). Application files live under /opt/onlyoffice/desktopeditors/.

If install stalls on ttf-mscorefonts-installer

OnlyOffice recommends ttf-mscorefonts-installer for Arial and Times New Roman metrics. On my VM the postinst script spent several minutes downloading .exe font payloads from SourceForge mirrors. Some mirrors failed with:

ERROR: cannot verify excellmedia.dl.sourceforge.net's certificate ...
  Issued certificate not yet valid.

That showed up alongside System clock synchronized: no in timedatectl command—the same class of clock-skew issue that breaks other vendor repos until NTP catches up. If timedatectl shows the wrong region, fix the zone with set timezone on Ubuntu before you retry the install.

Workarounds:

1. Sync time, then finish configuration:

sudo timedatectl set-ntp true
echo "ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula boolean true" | sudo debconf-set-selections
sudo DEBIAN_FRONTEND=noninteractive apt-get install -f -y

2. Skip the font recommend if you do not need Microsoft core fonts immediately:

sudo apt-get install -y --no-install-recommends onlyoffice-desktopeditors

3. If dpkg left OnlyOffice half-configured (iU status), repair with:

sudo apt-get install -f -y

That command configured gstreamer1.0-libav and onlyoffice-desktopeditors on my host after the font installer was removed.

Step 3: Launch OnlyOffice Desktop Editors

Graphical: open the app menu → Office → ONLYOFFICE (or search “OnlyOffice”).

After a successful install on Ubuntu 25.04, opening ONLYOFFICE from the app menu lands on the home screen with Document, Spreadsheet, and Presentation tiles, sidebar links for local files and templates, and a Select file drop zone:

Terminal:

desktopeditors

Open a specific file:

desktopeditors ~/Documents/report.docx

The .desktop entry registers dozens of MIME types—docx, xlsx, pptx, ODF, PDF, and more—so you can set OnlyOffice as the default handler in Settings → Apps → Default applications after install.

User settings and caches land under ~/.config/onlyoffice, ~/.local/share/onlyoffice, and ~/.cache/onlyoffice once you run the app.

Alternative: install the official .deb package

When you cannot add a repository (locked-down image, one-off VM, or policy that forbids extra sources.list entries), download the current amd64 package from Ascensio:

cd ~/Downloads
wget -O onlyoffice-desktopeditors_amd64.deb \
  https://download.onlyoffice.com/install/desktop/editors/linux/onlyoffice-desktopeditors_amd64.deb
sudo apt install -y ./onlyoffice-desktopeditors_amd64.deb

apt install ./file.deb resolves the same dependency chain as the repository package. The .deb URL returned HTTP 200 with content-length: 364644136 (~348 MB) when I checked headers—expect a long download on slow links.

You can still add the APT repo later for apt upgrade without reinstalling from scratch.

Alternative: Snap package

Canonical’s Snap store carries the same product name:

sudo snap install onlyoffice-desktopeditors

snap info onlyoffice-desktopeditors showed 9.4.0 on latest/stable (June 2026) at about 1.06 GB installed size. Snap confinement is convenient on Ubuntu Desktop when you do not want a vendor sources.list entry.

Remove later with:

sudo snap remove onlyoffice-desktopeditors

Do not install both the deb and Snap builds unless you intentionally want two copies—they register similar menu entries.

Alternative: Flatpak

Flatpak distributes OnlyOffice as org.onlyoffice.desktopeditors on Flathub. Enable Flathub once, then:

flatpak install flathub org.onlyoffice.desktopeditors
flatpak run org.onlyoffice.desktopeditors

Flatpak builds sometimes trail the .deb by a short window after major releases—fine for trials, but the APT repo is usually first for x86_64 Ubuntu.

Uninstall:

flatpak uninstall org.onlyoffice.desktopeditors

Uninstall OnlyOffice

Ascensio’s docs distinguish remove (keep local config) from purge (delete package metadata).

Keep configuration files:

sudo apt-get remove onlyoffice-desktopeditors

Remove configuration too:

sudo apt-get purge -y onlyoffice-desktopeditors
sudo apt-get autoremove -y

A purge dry-run on my host reported:

The following packages will be REMOVED:
  onlyoffice-desktopeditors*
Purg onlyoffice-desktopeditors [9.4.0-129]

Drop the repository when you no longer need updates:

sudo rm -f /etc/apt/sources.list.d/onlyoffice.list /usr/share/keyrings/onlyoffice.gpg

Delete personal data only when you are sure you do not need it:

rm -rf ~/.config/onlyoffice ~/.local/share/onlyoffice ~/.cache/onlyoffice

If anything remains under /opt/onlyoffice after a broken uninstall, Ascensio documents manual cleanup of that path and stale .desktop files—normally apt purge handles it.

For general uninstall patterns (purge vs remove, Snap, Flatpak), see remove software on Ubuntu.

Troubleshooting

References

• Installing ONLYOFFICE Desktop Editors on Debian/Ubuntu (official)
• ONLYOFFICE Desktop download page
• Install via Flatpak (official guide)
• OnlyOffice Desktop Editors on Snapcraft
• ONLYOFFICE Desktop Editors on Flathub

Summary

To install OnlyOffice on Ubuntu, add Ascensio’s signed download.onlyoffice.com repository, run sudo apt install onlyoffice-desktopeditors, and launch ONLYOFFICE from the Office menu or with desktopeditors. Version 9.4.0-129 landed under /opt/onlyoffice on Ubuntu 25.04. If apt pauses on Microsoft core fonts, sync time or use --no-install-recommends, then sudo apt install -f. For repo-less installs, use the official amd64 .deb; Snap and Flatpak suit sandboxed setups. This guide covers Desktop Editors only—pair it with the site’s LibreOffice removal walkthrough when you want a single local office suite.