apt install ffmpeg
> Reading package lists... Done Building dependency tree Reading state
> information... Done Some packages could not be installed. This may
> mean that you have requested an impossible situation or if you are
> using the unstable distribution that some required packages have not
> yet been created or been moved out of Incoming. The following
> information may help to resolve the situation:
>
> The following packages have unmet dependencies: ffmpeg : Depends:
> libavcodec58 (= 7:4.1.4-1~deb10u1.1)
> Depends: libavdevice58 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libavfilter7 (= 7:4.1.4-1~deb10u1.1)
> Depends: libavformat58 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libavresample4 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libavutil56 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libpostproc55 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libsdl2-2.0-0 (>= 2.0.9) but it is not going to be installed
> Depends: libswresample3 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed
> Depends: libswscale5 (= 7:4.1.4-1~deb10u1.1) but it is not going to be installed E: Unable to correct problems, you have held
> broken packages. root@vmi485211:/usr/local/centovacast/liquidsoap#
> ffmpeg --version ffmpeg: command not found
答案1
您的 sources.list 中有 debian 存储库（buster 10），这会破坏您的配置。
编辑你的 sources.list：
sudo apt edit-sources
或者
sudo nano /etc/apt/sources.list
如下：
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse
然后运行
sudo apt update
sudo apt upgrade
sudo apt install ffmpeg