cannot upgrade from 16.04 to 18.04

Bug #1809479 reported by huit
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ubuntu-release-upgrader (Ubuntu)
New
Undecided
Unassigned

Bug Description

i just run " sudo apt install update"
when finished, i reboot the pc.Then the system pops a window to upgrade.
so i confirm to do it.
and failed

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Dec 22 00:00:15 2018
InstallationDate: Installed on 2017-04-09 (621 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-12-21 (0 days ago)
VarLogDistupgradeTermlog:

Revision history for this message
huit (huit) wrote :
tags: added: xenial2bionic
tags: added: third-party-packages
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