unknown problem, just tried to upgrade

[Gavin Mitchell]

As the debug information explains, I tried to upgrade from ubuntu 18.04.3 to ubuntu 19.04 and it failed for some unknown reason.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.34
ProcVersionSignature: Ubuntu 5.0.0-25.26~18.04.1-generic 5.0.18
Uname: Linux 5.0.0-25-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CrashDB: ubuntu
Date: Mon Aug 26 18:31:05 2019
InstallationDate: Installed on 2019-08-19 (7 days ago)
InstallationMedia: Xubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2019-08-26 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2019-08-26 18:30:16.107497
 Log time: 2019-08-26 18:30:26.070926
 Log time: 2019-08-26 18:30:50.589430
 Log time: 2019-08-26 18:31:10.359491
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2019-08-18T21:27:05.020862