Public bug reported:

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> 
About Ubuntu: 
Description:    Ubuntu Groovy Gorilla (development branch)
Release:        20.10
2) The version of the package you are using, via 'apt-cache policy pkgname' or 
by checking in Software Center
1:20.10.1
3) What you expected to happen
I expected to see the window "Your system is up to date"
4) What happened instead
It crashed and Ubuntu asked me to send the report.

ProblemType: Crash
DistroRelease: Ubuntu 20.10
Package: update-manager 1:20.10.1
ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
Uname: Linux 5.8.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
AssertionMessage: corrupted double-linked list
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep  6 00:55:20 2020
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2020-09-05 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
InterpreterPath: /usr/bin/python3.8
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 
3.8.2-0ubuntu2
PythonDetails: N/A
Signal: 6
SourcePackage: update-manager
StacktraceTop:
 __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f61a86a2285 
"%s\n") at ../sysdeps/posix/libc_fatal.c:155
 malloc_printerr (str=str@entry=0x7f61a86a0457 "corrupted double-linked list") 
at malloc.c:5347
 unlink_chunk (p=p@entry=0x342f050, av=0x7f61a86d3b80 <main_arena>) at 
malloc.c:1460
 malloc_consolidate (av=av@entry=0x7f61a86d3b80 <main_arena>) at malloc.c:4494
 _int_malloc (av=av@entry=0x7f61a86d3b80 <main_arena>, bytes=bytes@entry=1368) 
at malloc.c:3699
Title: update-manager assert failure: corrupted double-linked list
UpgradeStatus: Upgraded to groovy on 2020-09-05 (0 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
separator:

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash groovy third-party-packages

** Information type changed from Private to Private Security

** Information type changed from Private Security to Public

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https://bugs.launchpad.net/bugs/1894404

Title:
  update-manager assert failure: corrupted double-linked list

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