看起来你在升级Perl包的时候遇到了dpkg脚本执行权限被拒绝的问题，这种情况在Ubuntu Server上通常和文件系统权限异常、安全工具限制或者dpkg状态损坏有关。先把你遇到的错误日志贴出来方便参考：

root@XXXXXXXXXX:/home/user# apt install /var/cache/apt/archives/perl_5.36.0-7ubuntu0.23.04.2_amd64.deb

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

Note, selecting 'perl' instead of '/var/cache/apt/archives/perl_5.36.0-7ubuntu0.23.04.2_amd64.deb'

The following additional packages will be installed:

perl-base

Suggested packages:

perl-doc libterm-readline-gnu-perl | libterm-readline-perl-perl

libtap-harness-archive-perl

The following packages will be upgraded:

perl perl-base

2 upgraded, 0 newly installed, 0 to remove and 47 not upgraded.

5 not fully installed or removed.

Need to get 0 B/2,020 kB of archives.

After this operation, 0 B of additional disk space will be used.

Do you want to continue? [Y/n] Y

(Reading database ... 116068 files and directories currently installed.)

Preparing to unpack .../perl_5.36.0-7ubuntu0.23.04.2_amd64.deb ...

dpkg (subprocess): unable to execute new perl package pre-installation script (/var/lib/dpkg/tmp.ci/preinst): Permission denied

dpkg: error processing archive /var/cache/apt/archives/perl_5.36.0-7ubuntu0.23.04.2_amd64.deb (--unpack):

new perl package pre-installation script subprocess returned error exit status 2

dpkg (subprocess): unable to execute new perl package post-removal script (/var/lib/dpkg/tmp.ci/postrm): Permission denied

dpkg: error while cleaning up:

new perl package post-removal script subprocess returned error exit status 2

Preparing to unpack .../perl-base_5.36.0-7ubuntu0.23.04.2_amd64.deb ...

dpkg (subprocess): unable to execute new perl-base package pre-installation script (/var/lib/dpkg/tmp.ci/preinst): Permission denied

dpkg: error processing archive /var/cache/apt/archives/perl-base_5.36.0-7ubuntu0.23.04.2_amd64.deb (--unpack):

new perl-base package pre-installation script subprocess returned error exit status 2

dpkg (subprocess): unable to execute new perl-base package post-removal script (/var/lib/dpkg/tmp.ci/postrm): Permission denied

dpkg: error while cleaning up:

new perl-base package post-removal script subprocess returned error exit status 2

Errors were encountered while processing:

/var/cache/apt/archives/perl_5.36.0-7ubuntu0.23.04.2_amd64.deb

/var/cache/apt/archives/perl-base_5.36.0-7ubuntu0.23.04.2_amd64.deb

E: Sub-process /usr/bin/dpkg returned an error code (1)

我之前处理过类似的问题，给你几个分步排查的方案：

1. 检查脚本和临时目录的权限 #

dpkg会把包的脚本临时解压到/var/lib/dpkg/tmp.ci/目录，首先确认这个目录和里面的脚本权限是否正常：

# 检查临时目录权限
ls -ld /var/lib/dpkg/tmp.ci/
# 检查脚本的权限和属主
ls -l /var/lib/dpkg/tmp.ci/preinst /var/lib/dpkg/tmp.ci/postrm

正常情况下，目录应该是drwx------ root root权限，脚本应该带有可执行权限（-rwxr-xr-x root root）。如果权限不对，手动修复：

# 修复目录权限
chmod 700 /var/lib/dpkg/tmp.ci/
chown root:root /var/lib/dpkg/tmp.ci/
# 给脚本添加执行权限
chmod +x /var/lib/dpkg/tmp.ci/preinst /var/lib/dpkg/tmp.ci/postrm

修复后再尝试重新执行安装/升级命令。

2. 检查安全工具的限制 #

Ubuntu默认启用AppArmor，可能是它阻止了dpkg执行脚本。你可以先临时关闭AppArmor试试：

systemctl stop apparmor

然后重新运行apt install --fix-broken或者你原来的升级命令。如果成功了，再重新开启AppArmor：

systemctl start apparmor

之后可以检查AppArmor的日志（/var/log/syslog），看看是不是有相关的规则需要调整。

3. 修复dpkg的损坏状态 #

如果是dpkg本身的状态损坏，可以尝试强制配置未完成的包：

dpkg --configure -a

或者用apt的修复命令自动处理依赖和损坏的安装：

apt-get install --fix-broken

这个命令会自动清理错误的包状态，重新尝试完成安装/升级。

4. 检查文件系统挂载选项 #

如果你的/var目录是单独挂载的，可能挂载时用了noexec选项（禁止执行文件），这会导致脚本无法运行。用mount命令检查：

mount | grep /var

如果看到noexec字样，重新挂载去掉这个选项：

mount -o remount,rw,exec /var

之后再重试操作。

这些步骤应该能解决大部分这类权限拒绝的问题，你可以按顺序尝试，先从最简单的权限检查开始。

备注：内容来源于stack exchange，提问作者Anji Rapeti