Linux Snap Package Error — What It Means & How to Fix It

What Does This Error Mean?

A Snap package error means a Snap application failed to install, update, or launch. Snap is a packaging system developed by Canonical (Ubuntu's creator) that bundles apps with all their dependencies. Common errors include the snapd daemon not running, insufficient disk space in the snap loop device, or a failed Snap Store connection. Most Snap errors are fixable with a quick service restart or a forced refresh.

Affected Models

Ubuntu 18.04 and newer
Ubuntu Server 18.04 and newer
Linux Mint 20.04+ (with Snap re-enabled)
Raspberry Pi OS (Raspbian with snapd)
Any Linux distribution with snapd installed

Common Causes

The snapd service has stopped or failed and needs to be restarted
Snap Store connection is down or your network is blocking access to snapcraft.io
The snap loop device mount has failed, preventing the installed snap from launching
Snap package is outdated and conflicts with the current system libraries
Insufficient disk space for snap to create or update the snap squashfs image

How to Fix It

Check the snapd service status. Open a terminal and run: sudo systemctl status snapd. If it shows 'failed' or 'inactive', restart it: sudo systemctl restart snapd.

The snapd service must be running for any snap commands to work. This is the first thing to check.
Refresh your snaps manually. Run: sudo snap refresh. This updates all installed snaps to their latest versions and often resolves launch errors caused by stale snap versions.

If snap refresh shows a connection error, check your internet connection and verify snapcraft.io is not blocked by your firewall.
If a specific snap will not launch, try removing and reinstalling it. Run: sudo snap remove [package-name], then sudo snap install [package-name].

A corrupted snap squashfs image cannot be repaired — you must remove and reinstall.
Check disk space. Run: df -h. Make sure /var/snap has sufficient free space (at least 1 to 2 GB for most snap packages). Snaps store data in /var/snap and mount images in /var/lib/snapd/.

Low disk space is a common hidden cause of Snap failures. Free up space using: sudo apt autoremove and sudo apt clean.
Check snap mount points. Run: snap list to see installed snaps, then: df -h | grep snap to see mounted loop devices. If a snap is missing its mount, run: sudo systemctl restart snapd to remount them.

After a crash or improper shutdown, snap loop devices can become unmounted, making the apps unlaunchable.

When to Call a Professional

Snap errors do not require professional service. All fixes are done in the terminal. If you decide Snap is not for you, most Snap packages are also available as .deb packages through your distribution's package manager.

Frequently Asked Questions

What is the difference between Snap, Flatpak, and APT packages?

APT packages are traditional Debian/Ubuntu packages that use shared system libraries — they are smaller but can have dependency conflicts. Snap packages bundle their own libraries and run in a sandboxed environment — they are larger but more isolated. Flatpak is similar to Snap but more common on Fedora and KDE-based distributions. All three are valid ways to install software on Linux.

Why do Snap apps take longer to open than regular apps?

Snap apps must mount a squashfs image and set up their sandbox environment before launching. This adds 2 to 5 seconds to startup time compared to natively installed apps. This is a known limitation of the Snap format. Once an app is running, performance is the same as a native app.

Can I disable Snap and use regular packages instead?

Yes. Run: sudo systemctl disable --now snapd to disable the snap service. You can then uninstall snapd entirely with: sudo apt remove snapd. Most software available as a Snap is also available as a .deb package through APT or as a Flatpak. Note that on Ubuntu, some system tools like Firefox may default to Snap and will need to be replaced with the APT version.