Introduction

掲題通りのエラー。
apt で　ffmpeg をインストールしようとしたら遭遇。

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$ sudo apt install ffmpeg

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages were automatically installed and are no longer required:
  dh-elpa-helper libc++1-14 libc++abi1-14 libnvidia-cfg1-550 libnvidia-common-550 libnvidia-compute-550 libnvidia-compute-550:i386 libnvidia-decode-550 libnvidia-decode-550:i386 libnvidia-encode-550
  libnvidia-encode-550:i386 libnvidia-extra-550 libnvidia-fbc1-550 libnvidia-fbc1-550:i386 libnvidia-gl-550 libnvidia-gl-550:i386 librhash0 libunwind-14 linux-modules-nvidia-550-oracle-lts-22.04
  nvidia-compute-utils-550 nvidia-firmware-550-550.144.03 nvidia-kernel-common-550 nvidia-kernel-source-550 nvidia-utils-550 xserver-xorg-video-nvidia-550
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libass9 libavdevice58 libavfilter7 libbs2b0 libdecor-0-0 libdecor-0-plugin-1-cairo libflite1 liblilv-0-0 libmysofa1 libopenal-data libopenal1 libpocketsphinx3 libpostproc55 librubberband2
  libsdl2-2.0-0 libserd-0-0 libsndio7.0 libsord-0-0 libsphinxbase3 libsratom-0-0 libvidstab1.1 libzimg2 pocketsphinx-en-us
Suggested packages:
  ffmpeg-doc libportaudio2 serdi sndiod sordi
The following NEW packages will be installed:
  ffmpeg libass9 libavdevice58 libavfilter7 libbs2b0 libdecor-0-0 libdecor-0-plugin-1-cairo libflite1 liblilv-0-0 libmysofa1 libopenal-data libopenal1 libpocketsphinx3 libpostproc55 librubberband2
  libsdl2-2.0-0 libserd-0-0 libsndio7.0 libsord-0-0 libsphinxbase3 libsratom-0-0 libvidstab1.1 libzimg2 pocketsphinx-en-us
0 upgraded, 24 newly installed, 0 to remove and 291 not upgraded.
6 not fully installed or removed.
Need to get 0 B/48.0 MB of archives.
After this operation, 80.7 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up install-info (6.8-4build1) ...
/usr/sbin/update-info-dir: 2: /etc/environment: source: not found
dpkg: error processing package install-info (--configure):
 installed install-info package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
 install-info
E: Sub-process /usr/bin/dpkg returned an error code (1)

apt update しても解決せず。

Why?

How to resolve?

Can’t upgrade - error “/etc/environment: source: not found” and “error processing package install-info” というドンピシャな記事が。
さすが ask Ubuntu。

下記の通り実行し、再度インストールを試みたら解決。

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$ cd /var/lib/dpkg/info
$ sudo rm *.postinst
$ sudo apt-get update