И это всё МОЁ

cat /etc/apt/sources.list.d/multimedia.list


# multimedia
deb www.deb-multimedia.org buster main non-free


cat /etc/apt/apt.conf.d/99enable-unsecure-repos


# Acquire::Check-Valid-Until "false";
Acquire::AllowInsecureRepositories "true";
# Acquire::AllowDowngradeToInsecureRepositories "true";


apt-get update


apt-get install -t deb-multimedia mpv


Reading package lists... Done
E: The value 'deb-multimedia' is invalid for APT::Default-Release as such a release is not available in the sources









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