Ubuntu虚拟机删除devloop

Ubuntu虚拟机删除dev/loop

【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 *** 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