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.
0 r7 ^) V: z- A- Z$ NE: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?



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7 o1 Y7 _- m4 \6 y0 B+ `9 l; F7 oroot@compute01:~# ps -A |grep apt
/ p3 a( v7 `" \1 Lroot@compute01:~# ps -A |grep apt-get


$ sudo kill -9 processnumber
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kill -SIGKILL processnumber
9 J0 c# j$ q1 G; C5 V+ p
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
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- h7 q6 r2 M5 @$ \* [2 D6 \4 G删除锁定文件
% B! f8 c6 ^: X; e9 g% _  S3 V( C8 U% B
. U# D! }) C% G+ T" d  o( a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。

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。
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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。

   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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root@compute01:~# apt-get -y upgrade
Reading package lists... Done
) N; E  U9 F! `- N% a* UBuilding dependency tree... Done
% X) G1 I2 C' Z- K: lReading state information... Done
Calculating upgrade... Done
  S" X2 x/ p# }# |. y2 rThe following packages will be upgraded:
  ~" L; n' ~- B8 L5 c  q0 z* H  apparmor apport apt distro-info-data dpkg grub-common grub-pc grub-pc-bin
  grub2-common isc-dhcp-client isc-dhcp-common libapparmor1 libapt-pkg6.0
4 ]# a- r6 Y; j. i6 q* v% m% {  libgssapi-krb5-2 libip4tc2 libk5crypto3 libkrb5-3 libkrb5support0 libldap-2.5-0
  libldap-common libnetplan0 libnss-systemd libpam-systemd libsasl2-2
( w$ Y5 u2 b* V4 y  libsasl2-modules libsasl2-modules-db libsystemd0 libudev1 libxtables12
6 S$ Z1 H$ ?7 y) ]" F+ Z  linux-firmware mdadm netplan.io python3-apport python3-problem-report
# t+ g9 I+ V# g" g  python3-software-properties python3-tz python3-yaml software-properties-common
  systemd systemd-hwe-hwdb systemd-sysv tzdata ubuntu-drivers-common udev
0 k1 {' L) |) b( V44 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 267 MB of archives.
After this operation, 2741 kB of additional disk space will be used.
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