package libc6:amd64 2.31-0ubuntu9 failed to install/upgrade: installed libc6:amd64 package post-installation script subprocess returned error exit status 1

[FullName]

Trying to update "Ubuntu 18.04.4 LTS" to 20.04 LTS on WSL1.
Got an error:

Setting up libc6:amd64 (2.31-0ubuntu9) ...
Checking for services that may need to be restarted...
Checking init scripts...
Restarting services possibly affected by the upgrade:
  cron: restarting...done.
  rsync: restarting...done.
  atd: restarting...done.

Services restarted successfully.
sleep: cannot read realtime clock: Invalid argument
dpkg: error processing package libc6:amd64 (--configure):
 installed libc6:amd64 package post-installation script subprocess returned error exit status 1
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: libc6:amd64 2.31-0ubuntu9
ProcVersionSignature: Microsoft 4.4.0-18362.836-Microsoft 4.4.35
Uname: Linux 4.4.0-18362-Microsoft x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Thu Jun 11 09:09:52 2020
Dmesg: [ 0.039148] Microsoft 4.4.0-18362.836-Microsoft 4.4.35
ErrorMessage: installed libc6:amd64 package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.6, Python 3.6.9, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.3
 apt 1.6.12ubuntu0.1
SourcePackage: glibc
Title: package libc6:amd64 2.31-0ubuntu9 failed to install/upgrade: installed libc6:amd64 package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2020-06-11 (0 days ago)

[FullName (morp007)]

Seems like sleep dont work in WSL1.

Please close this bug.

[FullName (morp007)]

P.S. Workaround: add echo before sleep in these files:
  /var/lib/dpkg/info/libc6:amd64.postinst;
  /var/lib/dpkg/info/libpam0g:amd64.postinst.

After that I successfully update to 20.04 LTS.