Error upgrading from 18.04 to 20.04

[dpcat237]

From main.log:
Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.

I tried to fix errors with sudo apt --fix-broken install but are not any error. This is also empty dpkg --get-selections | grep hold.

I attached logs. What else I can do to fix this upgrade issue?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
Uname: Linux 4.20.10-042010-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 23 20:19:10 2020
InstallationDate: Installed on 2019-01-17 (461 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-04-23 (0 days ago)
VarLogDistupgradeTermlog: