今天安装个firewalld防火墙的时候一直安装不上，提示：
The following packages have unmet dependencies:
firewalld : Depends: python3-slip-dbus but it is not going to be installed
Recommends: ebtables (>= 2.0.10.4-3.1~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
然后网上查了说先安装aptitude，然后用aptitude来安装软件包，结果安装aptitude的时候又报错：
The following packages have unmet dependencies:
aptitude : Depends: libapt-pkg5.0 (>= 1.1) but it is not going to be installed
Recommends: libparse-debianchangelog-perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
最后抱着试一下的心态换个源再安装，没想到换源后真的安装成功了。
最后分享一下更换的源（Ubuntu20.04，腾讯的源）
deb https://mirrors.cloud.tencent.com/ubuntu/ jammy main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ jammy main restricted universe multiverse
deb https://mirrors.cloud.tencent.com/ubuntu/ jammy-security main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ jammy-security main restricted universe multiverse
deb https://mirrors.cloud.tencent.com/ubuntu/ jammy-updates main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ jammy-updates main restricted universe multiverse
deb https://mirrors.cloud.tencent.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb https://mirrors.cloud.tencent.com/ubuntu/ jammy-backports main restricted universe multiverse
deb-src https://mirrors.cloud.tencent.com/ubuntu/ jammy-backports main restricted universe multiverse原创文章，作者：小哆啦，如若转载，请注明出处：https://www.notevm.com/a/6217.html
