Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 1323 (unat

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E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 1323 (unattended-upgr)
N: Be aware that removing the lock file is not a solution and may break your system.
% x( d- Q9 `* `) J! oE: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
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查找

. |; R4 R$ e2 ^5 e2 q8 aroot@compute01:~# ps -A |grep apt
' D. M9 k" b- {, s" \$ @root@compute01:~# ps -A |grep apt-get

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  T9 {( D+ [" e- M$ sudo kill -9 processnumber
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  R+ V7 o9 I* w' a) ^0 S! Jkill -SIGKILL processnumber
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% T% g0 d, r2 V. _2 c% S, }  Z4 q比如，下面命令中的9是 SIGKILL 的信号数，它会杀掉第一个 apt 进程

删除锁定文件
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" n4 @- Q( O# T! i; f# K锁定的文件会阻止 Linux 系统中某些文件或者数据的访问，这个概念也存在于 Windows 或者其他的操作系统中。

5 R" j- |' ]: h! ~' |, h6 J一旦你运行了 apt-get 或者 apt 命令，锁定文件将会创建于 /var/lib/apt/lists/、/var/lib/dpkg/、/var/cache/apt/archives/ 中。

这有助于运行中的 apt-get 或者 apt 进程能够避免被其它需要使用相同文件的用户或者系统进程所打断。当该进程执行完毕后，锁定文件将会删除。

" V: [! }! U0 s% J) S; Q& _   当你没有看到 apt-get 或者 apt 进程的情况下在上面两个不同的文件夹中看到了锁定文件，这是因为进程由于某个原因被杀掉了，因此你需要删除锁定文件来避免该错误。
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  N  U& U3 F& P4 Groot@compute01:~# apt-get -y upgrade
Reading package lists... Done
( T( F3 T, g2 tBuilding dependency tree... Done
Reading state information... Done
$ a/ ~, C5 p- Z4 d' I2 QCalculating upgrade... Done
The following packages will be upgraded:
  apparmor apport apt distro-info-data dpkg grub-common grub-pc grub-pc-bin
; d: f6 d& o# \  grub2-common isc-dhcp-client isc-dhcp-common libapparmor1 libapt-pkg6.0
( v4 `/ q5 h( _; e  libgssapi-krb5-2 libip4tc2 libk5crypto3 libkrb5-3 libkrb5support0 libldap-2.5-0
! I2 m4 l1 _1 B6 X: R  libldap-common libnetplan0 libnss-systemd libpam-systemd libsasl2-2
  libsasl2-modules libsasl2-modules-db libsystemd0 libudev1 libxtables12
; e7 `& s2 Y- I  linux-firmware mdadm netplan.io python3-apport python3-problem-report
" R  |: p5 F' g6 b, x2 j( b  python3-software-properties python3-tz python3-yaml software-properties-common
; g" j1 T/ [4 I& }0 i2 D  systemd systemd-hwe-hwdb systemd-sysv tzdata ubuntu-drivers-common udev
* y& P' D4 t! f4 C# c# p44 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 267 MB of archives.
% {3 c2 F" F- a, S: qAfter this operation, 2741 kB of additional disk space will be used.
+ f4 f1 B7 H$ p0% [Working]

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