"could not initialize the package information"

[Bogdan Todorov]

I am trying to update ubuntu and this is what appeared:

Please report this bug against the 'update-manager' package and include the following error message:
E:No priority (or zero) specified for pin

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.32
ProcVersionSignature: Ubuntu 4.13.0-26.29~16.04.2-generic 4.13.13
Uname: Linux 4.13.0-26-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.30
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Dec 15 00:39:37 2021
InstallationDate: Installed on 2017-08-28 (1569 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)