Replace Snap with Flatpak on Ubuntu, Kubuntu, and Debian

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Remove and Block Snap on Debian-Based Systems

de-snap.sh removes installed Snap packages and snapd, deletes remaining Snap data, and creates an APT pin that prevents snapd from being installed again.

This script has been tested on Ubuntu, Kubuntu, and Debian. Other Debian-based distributions may work, but they have not been tested.

Important warning

This script is intentionally destructive. It removes:

All installed Snap packages
The snapd package
Snap data stored in $HOME/snap
System Snap data under /snap, /var/snap, /var/lib/snapd, and /var/cache/snapd

Back up any Snap application data you want to keep before running it. Removed application data cannot be recovered by reinstalling snapd.

The script does not automatically replace removed Snap applications with Debian packages or Flatpak applications.

What it does

The script:

Detects the current Debian-based operating system.
Removes installed Snap packages while the Snap daemon is still available.
Stops and disables the remaining Snap services.
Purges snapd and unused dependencies.
Deletes remaining user and system Snap data.
Creates /etc/apt/preferences.d/nosnap.pref with a negative APT priority.
Verifies that APT cannot select snapd for installation.
Installs Flatpak and adds the system-wide Flathub remote.

It is safe to run the script again after Snap has already been removed. The APT pin and Flathub remote are reapplied without creating duplicates.

Requirements

Ubuntu, Kubuntu, Debian, or a similar Debian-based distribution
A normal user account with sudo access
An internet connection for updating APT metadata
Bash

Usage

Download de-snap.sh, review it, and make it executable:

chmod +x de-snap.sh

Run it as your normal user:

./de-snap.sh

Do not run the entire script with sudo. It requests elevated privileges only for system-level changes.

Completing the removal

Reboot after the script finishes:

sudo reboot

This unloads any remaining Snap mounts and services from the current session.

Allowing snapd again

To remove the APT pin and allow snapd to be installed again:

sudo rm /etc/apt/preferences.d/nosnap.pref
sudo apt-get update

You can then reinstall it if needed:

sudo apt-get install snapd

Removing the pin does not restore previously deleted Snap applications or their data.

Notes

Some distribution packages may expect or attempt to install snapd. With the pin active, those installations can fail until you choose a non-Snap package source or remove the pin.

Review the script and understand the removal paths before using it on an important system.

de-snap.sh

	#!/usr/bin/env bash

	set -euo pipefail

	PIN_FILE="/etc/apt/preferences.d/nosnap.pref"

	if ((EUID == 0)); then
	echo "ERROR: Run this script as your normal user, not with sudo." >&2
	echo "The script will request sudo only for system-level changes." >&2
	exit 1
	fi

	for command_name in apt-get dpkg-query sudo; do
	if ! command -v "$command_name" >/dev/null 2>&1; then
	echo "ERROR: Required command not found: $command_name" >&2
	exit 1
	fi
	done

	package_installed() {
	dpkg-query -W -f='${db:Status-Status}' "$1" 2>/dev/null \
	\| grep -q '^installed
	}

	list_installed_snaps() {
	snap list 2>/dev/null \| awk 'NR > 1 {print $1}'
	}

	remove_installed_snaps() {
	local snap_names
	local removed_any

	while true; do
	snap_names="$(list_installed_snaps \|\| true)"

	if [[ -z "$snap_names" ]]; then
	return
	fi

	removed_any=false

	while IFS= read -r snap_name; do
	[[ -n "$snap_name" ]] \|\| continue
	echo "Removing Snap package: $snap_name"

	if sudo snap remove --purge "$snap_name"; then
	removed_any=true
	fi
	done <<< "$snap_names"

	if [[ "$removed_any" == false ]]; then
	echo "WARNING: Some Snap packages could not be removed cleanly." >&2
	echo "Their remaining data will be removed with snapd." >&2
	return
	fi
	done
	}

	echo
	echo "=== Checking the operating system ==="

	if [[ -r /etc/os-release ]]; then
	# shellcheck disable=SC1091
	source /etc/os-release
	echo "Detected: ${PRETTY_NAME:-unknown Debian-based system}"

	if [[ "${ID:-}" != "debian" && "${ID:-}" != "ubuntu" && "${ID_LIKE:-}" != debian ]]; then
	echo "WARNING: This script has only been tested on Ubuntu, Kubuntu, and Debian." >&2
	fi
	fi

	echo
	echo "=== Removing installed Snap packages ==="

	if package_installed snapd && command -v snap >/dev/null 2>&1; then
	remove_installed_snaps
	else
	echo "snapd is not installed; skipping Snap package removal."
	fi

	echo
	echo "=== Stopping and purging snapd ==="

	if command -v systemctl >/dev/null 2>&1; then
	sudo systemctl disable --now \
	snapd.service \
	snapd.socket \
	snapd.seeded.service \
	2>/dev/null \|\| true
	fi

	if package_installed snapd; then
	sudo apt-get purge -y snapd
	sudo apt-get autoremove --purge -y
	else
	echo "snapd package is already absent."
	fi

	sudo umount -R /snap 2>/dev/null \|\| true

	rm -rf -- "${HOME:?}/snap"

	sudo rm -rf -- \
	/snap \
	/var/snap \
	/var/lib/snapd \
	/var/cache/snapd

	echo
	echo "=== Preventing future snapd installation ==="

	sudo tee "$PIN_FILE" >/dev/null <<'EOF'
	Package: snapd
	Pin: release a=*
	Pin-Priority: -10
	EOF

	sudo apt-get update

	echo
	echo "=== Verifying the snapd pin ==="

	if sudo apt-get install --simulate snapd >/dev/null 2>&1; then
	echo "ERROR: Verification failed; APT can still select snapd for installation." >&2
	exit 1
	fi

	echo "Verification passed: APT cannot select snapd for installation."

	echo
	echo "=== Installing Flatpak and adding Flathub ==="

	sudo apt-get install -y flatpak
	sudo flatpak remote-add --if-not-exists \
	flathub \
	https://flathub.org/repo/flathub.flatpakrepo

	echo
	echo "=== Snap removal, pinning, and Flatpak setup complete ==="
	echo "Reboot to finish unloading any remaining Snap mounts and services."

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