运行 erdpy-up 时出现未满足的依赖项venv 和 ensurepip错误

如何解决运行 erdpy-up 时出现未满足的依赖项venv 和 ensurepip错误

尝试安装 erdpy 失败并显示以下错误：

$ python3 erdpy-up.py 

INFO:installer:Checking user.
INFO:installer:Checking Python version.
INFO:installer:Python version: sys.version_info(major=3,minor=6,micro=9,releaselevel='final',serial=0)
INFO:installer:Checking operating system.
INFO:installer:Operating system: linux
INFO:installer:Package [venv] or [ensurepip] not found,will be installed.
INFO:installer:Running [$ sudo apt-get install python3-venv]:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libc6-dbg : Depends: libc6 (= 2.27-3ubuntu1.4) but 2.27-3ubuntu1.3 is to be installed
 libc6-dev : Depends: libc6 (= 2.27-3ubuntu1.4) but 2.27-3ubuntu1.3 is to be installed
 libnss-systemd : Depends: systemd (= 237-3ubuntu10.44)
 python3-venv : Depends: python3.6-venv (>= 3.6.7-1~) but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
CRITICAL:installer:Packages [venv] or [ensurepip] not installed correctly.

但是，按原样运行推荐的 apt --fix-broken install 失败并出现以下错误：

$ sudo apt --fix-broken install

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libc6 libc6:i386 libpam-systemd libsystemd0 libsystemd0:i386 systemd
Suggested packages:
  glibc-doc glibc-doc:i386 locales:i386 systemd-container
The following packages will be upgraded:
  libc6 libc6:i386 libpam-systemd libsystemd0 libsystemd0:i386 systemd
6 upgraded,0 newly installed,0 to remove and 161 not upgraded.
6 not fully installed or removed.
Need to get 0 B/8,838 kB of archives.
After this operation,3,072 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
(Reading database ... 326363 files and directories currently installed.)
Preparing to unpack .../libc6_2.27-3ubuntu1.4_amd64.deb ...
De-configuring libc6:i386 (2.27-3ubuntu1.3) ...
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
dpkg: error processing archive /var/cache/apt/archives/libc6_2.27-3ubuntu1.4_amd64.deb (--unpack):
 new libc6:amd64 package pre-installation script subprocess returned error exit status 1
Preparing to unpack .../libc6_2.27-3ubuntu1.4_i386.deb ...
De-configuring libc6:amd64 (2.27-3ubuntu1.3) ...
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
dpkg: error processing archive /var/cache/apt/archives/libc6_2.27-3ubuntu1.4_i386.deb (--unpack):
 new libc6:i386 package pre-installation script subprocess returned error exit status 1
Preparing to unpack .../libpam-systemd_237-3ubuntu10.44_amd64.deb ...
Unpacking libpam-systemd:amd64 (237-3ubuntu10.44) over (237-3ubuntu10.41) ...
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.27-3ubuntu1.4_amd64.deb
 /var/cache/apt/archives/libc6_2.27-3ubuntu1.4_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

详情：

• 操作系统：Ubuntu 18.04

• Python：3.6.9

解决方法

问题的根本原因在 fix-broken 命令的输出中清楚地突出显示：

debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process

这是一个 Linux 级别的问题，其中对该文件的锁定已被另一个进程占用，并且其步骤已被记录here：

sudo fuser -v /var/cache/debconf/config.dat

会告诉你哪个进程持有锁：

                     USER        PID ACCESS COMMAND
/var/cache/debconf/config.dat:
                     root      18210 F.... dpkg-preconfigu

然后你只需要记下PID并像这样杀死它：

$ sudo kill PID
$ sudo kill -9 PID  # if the first doesn't work

运行 askubuntu 问题中描述的这些步骤后，您可以运行：

$ sudo apt-get install -f

然后你可以运行：

sudo apt --fix-broken install

重试安装erdpy会成功：

$ python3 erdpy-up.py