dokcerfile. Сборка контейнера. Couldn't find any package by glob

[Женя32]

Здравствуйте!
Подскажите,, пожалуйста, почему при создании образа ошибка?:

sadmin@ubuntu-desktop--20-04:~/workdir$ sudo wget -q https://packages.sury.org/php/apt.gpg -O- | sudo apt-key add -
OK
sadmin@ubuntu-desktop--20-04:~/workdir$ echo "deb https://packages.sury.org/php/ stretch main" | sudo tee /etc/apt/sources.list.d/php.list
deb https://packages.sury.org/php/ stretch main
sadmin@ubuntu-desktop--20-04:~/workdir$ sudo docker build -t nginx_php_fpm_image .
Sending build context to Docker daemon 8.704kB
Step 1/15 : FROM ubuntu:20.04
---> ba6acccedd29
Step 2/15 : RUN apt-get update
---> Using cache
---> a7dc5ed48fef
Step 3/15 : RUN apt-get install -y nginx php7.2-fpm supervisor && rm -rf /var/lib/apt/lists/*
---> Running in 6d12706d48ca
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package php7.2-fpm
E: Couldn't find any package by glob 'php7.2-fpm'
E: Couldn't find any package by regex 'php7.2-fpm'
The command '/bin/sh -c apt-get install -y nginx php7.2-fpm supervisor && rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
sadmin@ubuntu-desktop--20-04:~/workdir$