Ubuntu卸载snap

最近由于复现实验新装了Ubuntu20.04，发现后台中snapd进程占用高。snap是Canonical公司推出的一款软件管理工具，在20.04以及之后版本Ubuntu中都有预装，但因其难用，资源占用高被广为诟病，特搜索整理资料将其卸载。

1.打开终端，输入snap list，查看已安装的软件

root@ubuntu2204:~# snap list
Name    Version        Rev    Tracking       Publisher   Notes
core20  20230622       1974   latest/stable  canonical✓  base
lxd     5.0.2-838e1b2  24322  5.0/stable/…   canonical✓  -
snapd   2.59.5         19457  latest/stable  canonical✓  snapd

2.停止snapd服务

root@ubuntu2204:~# systemctl disable snapd.service && systemctl disable snapd.socket && systemctl disable snapd.seeded.service

3.依次移除snap安装的软件

运行 sudo snap remove --purge lxd 等命令依次删除前面列表中的各个软件，需要注意的是在上述列表notes列表明是base的表示是其他软件的依赖项，需要放在最后面删除。比如上图中的core20等等

root@ubuntu2204:~# vi remove_snap_package.sh
#!/bin/bash
sum=$(snap list | awk 'NR>=2{print $1}' | wc -l)
while [ $sum -ne 0 ];do
    for p in $(snap list | awk 'NR>=2{print $1}') ;do
        snap remove --purge $p
    done
    sum=$(snap list | awk 'NR>=2{print $1}' | wc -l)
done

root@ubuntu2204:~# bash remove_snap_package.sh
# 提示如下，表明已经删除干净：
No snaps are installed yet. Try 'snap install hello-world'.

4.完全清除 snapd

root@ubuntu2204:~# apt -y autoremove --purge snapd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
  snapd* squashfs-tools* ubuntu-server-minimal*
0 upgraded, 0 newly installed, 3 to remove and 33 not upgraded.
After this operation, 103 MB disk space will be freed.
(Reading database ... 74127 files and directories currently installed.)
Removing ubuntu-server-minimal (1.481.1) ...
Removing snapd (2.58+22.04.1) ...
Warning: Stopping snapd.service, but it can still be activated by:
  snapd.socket
Removing squashfs-tools (1:4.5-3build1) ...
Processing triggers for dbus (1.12.20-2ubuntu4.1) ...
Processing triggers for man-db (2.10.2-1) ...
(Reading database ... 74018 files and directories currently installed.)
Purging configuration files for snapd (2.58+22.04.1) ...
rmdir: failed to remove '/etc/systemd/system/snapd.mounts.target.wants': No such file or directory
Discarding preserved snap namespaces
Final directory cleanup
Removing extra snap-confine apparmor rules
Removing snapd cache
Removing snapd state

5.删除缓存目录（如有）

root@ubuntu2204:~# rm -rf ~/snap && sudo rm -rf /snap && rm -rf /var/snap && rm -rf /var/lib/snapd && rm -rf /var/cache/snapd

6.防止apt update自动安装snap

即使使用以上命令移除了 Snap 软件包，但如果没有关闭 apt 触发器，sudo apt update命令会再一次将 Snap 安装回来。

要关闭它，需要在/etc/apt/preferences.d/目录下创建一个 apt 设置文件nosnap.pref来阻止 Snap 服务自动下载

运行命令vi /etc/apt/preferences.d/nosnap.pref，打开编辑器，输入以下内容并保存文件

root@ubuntu2004:~# cat > /etc/apt/preferences.d/no-snapd.pref << EOF
Package: snapd
Pin: release a=*
Pin-Priority: -10
EOF

文件保存后运行sudo apt update 即可。

root@ubuntu2204:~# apt update

7.一键ubuntu卸载snap脚本

Shell脚本源码地址：

Gitee：https://gitee.com/raymond9/shell
Github：https://github.com/raymond999999/shell

可以去上面的Gitee或Github代码仓库拉取脚本。

root@ubuntu2204:~# cat remove_snap.sh 
#!/bin/bash
#
#***************************************************************************************************
#Author:        Raymond
#QQ:            88563128
#Date:          2024-05-06
#FileName:      remove_snap.sh
#MIRROR:        raymond.blog.csdn.net
#Description:   remove_snap for Ubuntu 20.04/22.04
#Copyright (C): 2024 All rights reserved
#***************************************************************************************************
COLOR="echo -e \\033[01;31m"
END='\033[0m'

ubuntu_remove_snap(){
    dpkg -s snapd &> /dev/null || { ${COLOR}"snap已卸载！"${END};exit; }
    systemctl disable snapd.service && systemctl disable snapd.socket && systemctl disable snapd.seeded.service

    sum=$(snap list | awk 'NR>=2{print $1}' | wc -l)
    while [ $sum -ne 0 ];do
        for p in $(snap list | awk 'NR>=2{print $1}'); do
            snap remove --purge $p
        done
        sum=$(snap list | awk 'NR>=2{print $1}' | wc -l)
    done

    apt -y autoremove --purge snapd

    rm -rf ~/snap && sudo rm -rf /snap && rm -rf /var/snap && rm -rf /var/lib/snapd && rm -rf /var/cache/snapd

    cat > /etc/apt/preferences.d/no-snapd.pref << EOF
Package: snapd
Pin: release a=*
Pin-Priority: -10
EOF
    apt update
}

main(){
    ubuntu_remove_snap
}