.png)
将 Ubuntu 18.04 更新至 20.04 再更新至 21.04 后，我遇到了这个问题，无法安装也无法卸载软件包。
[sudo] password for commaderwolfer:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
git is already the newest version (1:2.32.0-1~ppa0~ubuntu18.04.1).
0 upgraded, 0 newly installed, 0 to remove and 14 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up postfix (3.5.6-1) ...
Postfix (main.cf) configuration was not changed. If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed. To view Postfix
configuration values, see postconf(1).
After modifying main.cf, be sure to run 'systemctl reload postfix'.
Running newaliases
newaliases: warning: valid_hostname: misplaced delimiter: CommanderWolfer..
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: CommanderWolfer..
dpkg: error processing package postfix (--configure):
installed postfix package post-installation script subprocess returned error exit status 75
Processing triggers for libc-bin (2.33-0ubuntu5) ...
Errors were encountered while processing:
postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)```
after running sudo dpkg --configure -a
sudo dpkg --configure -a
Setting up postfix (3.5.6-1) ...
Postfix (main.cf) configuration was not changed. If you need to make changes,
edit /etc/postfix/main.cf (and others) as needed. To view Postfix
configuration values, see postconf(1).
After modifying main.cf, be sure to run 'systemctl reload postfix'.
Running newaliases
newaliases: warning: valid_hostname: misplaced delimiter: CommanderWolfer..
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: CommanderWolfer..
dpkg: error processing package postfix (--configure):
installed postfix package post-installation script subprocess returned error exit status 75
Processing triggers for libc-bin (2.33-0ubuntu5) ...
Errors were encountered while processing:
postfix
答案1
E: Sub-process /usr/bin/dpkg returned an error code (1)
上述错误消息可能是由于 dpkg 数据库损坏或软件包损坏（postfix）造成的。使用以下命令解决。打开终端执行命令。
使用命令重新配置 dpkg 数据库
sudo dpkg --configure -a
修复损坏的软件包
sudo apt install--fix-broken
上述命令可能会解决问题。如果不能，请尝试在清除旧后重新安装 postfix。清除旧后缀
sudo apt remove --purge postfix
使用命令清理旧的和不必要的包
sudo apt clean
sudo apt autoremove
更新和升级软件包
sudo apt update
sudo apt upgrade
重新安装包
sudo apt-get install postfix