【本文任务描述】：在VM虚拟机安装了ubuntu18.04，插叙df的时候发现很多/dev/loop的占用都是100%，但实际上并没有用到。因此找方法将这些设备删除掉。
?【第一步】
直接尝试删除指令
apt autoremove --purge snapd?或者需要管理员权限来执行
sudo apt autoremove --purge snapd?如果报错如下所示，则进入第二步
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?【第二步】
尝试如下方案：
lsof /var/lib/dpkg/lock-frontend
sudo rm /var/lib/dpkg/lock-frontend然后重新配置
sudo dpkg --configure -a如果成功，可以再次执行第一步，如果报错如下
dpkg: error: dpkg status database is locked by another process则继续进行如下操作：
lsof /var/lib/dpkg/lock
lsof /var/lib/apt/lists/lock
lsof /var/cache/apt/archives/lock在执行过程中有可能会有以下信息提示
$ lsof /var/lib/apt/lists/lock
lsof: status error on /var/lib/apt/lists/lock: No such file or directory
lsof 4.89
latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]]
[-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
[+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]
Use the ``-h'' option to get more help information.不用管这些信息，继续执行
sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock也有可能出现如下信息提示
$ sudo rm /var/lib/apt/lists/lock
rm: cannot remove '/var/lib/apt/lists/lock': No such file or directory
也不用管这些，直接执行配置指令
sudo dpkg --configure -a如无报错，即可回到【第一步】继续执行。正确的效果如下，键入y即可继续执行，之后可能会走进度耽误几分钟。
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
gnome-software gnome-software-common
Suggested packages:
apt-config-icons-hidpi gnome-software-plugin-flatpak gnome-software-plugin-limba
Recommended packages:
gnome-software-plugin-snap
The following packages will be REMOVED:
gnome-software-plugin-snap* linux-hwe-5.4-headers-5.4.0-42* linux-hwe-5.4-headers-5.4.0-47*
linux-hwe-5.4-headers-5.4.0-48* snapd*
The following packages will be upgraded:
gnome-software gnome-software-common
2 upgraded, 0 newly installed, 5 to remove and 312 not upgraded.
Need to get 2,966 kB of archives.
After this operation, 316 MB disk space will be freed.
Do you want to continue? [Y/n] y展示效果如下图
?
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