1. 查看已安装的snap软件包

snap list

2. 卸载各snap软件包

sudo snap remove --purge firefox
sudo snap remove --purge gnome-3-38-2004
sudo snap remove --purge gtk-common-themes
sudo snap remove --purge bare
sudo snap remove --purge core20

最后删除snapd

sudo snap remove --purge snapd

3. 阻止snap软件包

sudo vim /etc/apt/preferences.d/nosnap.pref

    # To prevent repository packages from triggering the installation of snap,
    # this file forbids snapd from being installed by APT.

    Package: snapd
    Pin: release a=*
    Pin-Priority: -10

4. 添加Mozilla Team PPA

sudo add-apt-repository ppa:mozillateam/ppa

5. 安装Firefox

sudo apt update
sudo apt install -t 'o=LP-PPA-mozillateam' firefox

6. 设置Mozilla Team PPA的Firefox优先

sudo vim /etc/apt/preferences.d/mozillateamppa

Package: firefox*
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 501

7. 参考

https://ubuntuhandbook.org/index.php/2022/04/remove-snap-block-ubuntu-2204/

https://ubuntuhandbook.org/index.php/2022/04/install-firefox-deb-ubuntu-22-04/