Невозможно обновить сервер Ubuntu с 19.04 до 19.10 (не удалось найти 'ubuntu-minimal')

$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]
Get:2 Upgrade tool [1,319 kB]
Fetched 1,320 kB in 0s (0 B/s)
authenticate 'eoan.tar.gz' against 'eoan.tar.gz.gpg'
extracting 'eoan.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://asi-fs-n.contabo.net/ubuntu disco InRelease
Hit http://asi-fs-n.contabo.net/ubuntu disco-updates InRelease
Hit http://asi-fs-n.contabo.net/ubuntu disco-backports InRelease
Hit http://security.ubuntu.com/ubuntu disco-security InRelease
Hit http://ppa.launchpad.net/certbot/certbot/ubuntu disco InRelease
Hit http://archive.ubuntu.com/ubuntu disco InRelease
Hit http://repo.mysql.com/apt/ubuntu disco InRelease
Ign http://ppa.launchpad.net/deadsnakes/ppa/ubuntu disco InRelease
Hit http://ppa.launchpad.net/ondrej/php/ubuntu disco InRelease
Err http://ppa.launchpad.net/deadsnakes/ppa/ubuntu disco Release
  404  Not Found [IP: 91.189.95.83 80]
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Updating repository information

Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

To continue please press [ENTER]

Hit http://archive.ubuntu.com/ubuntu eoan InRelease
Hit http://security.ubuntu.com/ubuntu eoan-security InRelease
Fetched 0 B in 0s (0 B/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.


Restoring original system state

Aborting