Trying to upgrade to 20.04, but seems to get hung up

[John Shelley]

I am guessing there is some circular dependency references by looking at the apt.log

Broken gdal-data:amd64 Breaks on libgdal20:amd64 < 2.2.3+dfsg-2 @ii mK > (< 2.5.0~)
  Considering libgdal20:amd64 -1 as a solution to gdal-data:amd64 1
  Added libgdal20:amd64 to the remove list
  Fixing gdal-data:amd64 via remove of libgdal20:amd64
  MarkDelete libgdal20:amd64 < 2.2.3+dfsg-2 @ii mK > FU=0
Investigating (1) postgresql-12-postgis-3:amd64 < 3.0.2+dfsg-2.pgdg18.04+1 @ii mK Ib >
Broken postgresql-12-postgis-3:amd64 Depends on libgdal20:amd64 < 2.2.3+dfsg-2 @ii mR > (>= 2.0.1)
  Considering libgdal20:amd64 -1 as a solution to postgresql-12-postgis-3:amd64 0
  Added libgdal20:amd64 to the remove list
  Fixing postgresql-12-postgis-3:amd64 via keep of libgdal20:amd64
  MarkKeep libgdal20:amd64 < 2.2.3+dfsg-2 @ii mR > FU=0
Investigating (2) gdal-data:amd64 < 2.2.3+dfsg-2 -> 3.0.4+dfsg-1build3 @ii umU Ib >
Broken gdal-data:amd64 Breaks on libgdal20:amd64 < 2.2.3+dfsg-2 @ii mK > (< 2.5.0~)
  Considering libgdal20:amd64 -1 as a solution to gdal-data:amd64 1
  Added libgdal20:amd64 to the remove list
  Fixing gdal-data:amd64 via remove of libgdal20:amd64
  MarkDelete libgdal20:amd64 < 2.2.3+dfsg-2 @ii mK > FU=0
Investigating (2) postgresql-12-postgis-3:amd64 < 3.0.2+dfsg-2.pgdg18.04+1 @ii mK Ib >
Broken postgresql-12-postgis-3:amd64 Depends on libgdal20:amd64 < 2.2.3+dfsg-2 @ii mR > (>= 2.0.1)
  Considering libgdal20:amd64 1 as a solution to postgresql-12-postgis-3:amd64 0
  Removing postgresql-12-postgis-3:amd64 rather than change libgdal20:amd64
  MarkDelete postgresql-12-postgis-3:amd64 < 3.0.2+dfsg-2.pgdg18.04+1 @ii mK Ib > FU=0
Investigating (2) postgresql-12-pgrouting:amd64 < 3.0.2-1.pgdg18.04+1 @ii mK Ib >
Broken postgresql-12-pgrouting:amd64 Depends on postgresql-12-postgis:amd64 < none @un H >
  Considering postgresql-12-postgis-3:amd64 1 as a solution to postgresql-12-pgrouting:amd64 -2
  Removing postgresql-12-pgrouting:amd64 rather than change postgresql-12-postgis:amd64
  MarkDelete postgresql-12-pgrouting:amd64 < 3.0.2-1.pgdg18.04+1 @ii mK Ib > FU=0
Investigating (2) postgis:amd64 < 3.0.2+dfsg-2.pgdg18.04+1 @ii mK Ib >
Broken postgis:amd64 Depends on libgdal20:amd64 < 2.2.3+dfsg-2 @ii mR > (>= 2.0.1)
  Considering libgdal20:amd64 1 as a solution to postgis:amd64 -2
  Removing postgis:amd64 rather than change libgdal20:amd64
  MarkDelete postgis:amd64 < 3.0.2+dfsg-2.pgdg18.04+1 @ii mK Ib > FU=0
Done
Log time: 2020-09-15 02:27:23.395710

lsb_release -rd
Description: Ubuntu 18.04.5 LTS
Release: 18.04

=========================================

 apt-cache policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://ppa.launchpad.net/vbernat/haproxy-2.1/ubuntu bionic/main amd64 Packages
     release v=18.04,o=LP-PPA-vbernat-haproxy-2.1,a=bionic,n=bionic,l=HAProxy 2.1,c=main,b=amd64
     origin ppa.launchpad.net
 500 http://apt.postgresql.org/pub/repos/apt bionic-pgdg/main amd64 Packages
     release o=apt.postgresql.org,a=bionic-pgdg,n=bionic-pgdg,l=PostgreSQL for Debian/Ubuntu repository,c=main,b=amd64
     origin apt.postgresql.org
 500 http://us.archive.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-security,n=bionic,l=Ubuntu,c=multiverse,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-security/universe amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-security,n=bionic,l=Ubuntu,c=universe,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-security,n=bionic,l=Ubuntu,c=restricted,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-security,n=bionic,l=Ubuntu,c=main,b=amd64
     origin us.archive.ubuntu.com
 100 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-backports,n=bionic,l=Ubuntu,c=universe,b=amd64
     origin us.archive.ubuntu.com
 100 http://us.archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-backports,n=bionic,l=Ubuntu,c=main,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-updates,n=bionic,l=Ubuntu,c=multiverse,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-updates,n=bionic,l=Ubuntu,c=universe,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-updates,n=bionic,l=Ubuntu,c=restricted,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic-updates,n=bionic,l=Ubuntu,c=main,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic,n=bionic,l=Ubuntu,c=multiverse,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic,n=bionic,l=Ubuntu,c=universe,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic,n=bionic,l=Ubuntu,c=restricted,b=amd64
     origin us.archive.ubuntu.com
 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
     release v=18.04,o=Ubuntu,a=bionic,n=bionic,l=Ubuntu,c=main,b=amd64
     origin us.archive.ubuntu.com
Pinned packages:

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
Uname: Linux 4.15.0-117-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Tue Sep 15 02:35:38 2020
InstallationDate: Installed on 2020-03-09 (189 days ago)
InstallationMedia: Ubuntu-Server 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-15 (0 days ago)

[Brian Murray (brian-murray)]

The upgrade was not attempted due to you having postgres installed and the possibility of you losing your database(s).

2020-09-15 02:34:45,430 DEBUG blacklist expr '^postgresql-.*[0-9][0-9].*' matches 'postgresql-12-pgrouting'
2020-09-15 02:34:45,430 DEBUG The package 'postgresql-12-pgrouting' is marked for removal but it's in the removal blacklist
2020-09-15 02:34:45,445 ERROR Dist-upgrade failed: 'The package 'postgresql-12-pgrouting' is marked for removal but it is in the removal blacklist.'
2020-09-15 02:34:45,446 DEBUG abort called