package libc6:amd64 2.31-0ubuntu6 failed to install/upgrade: installed libc6:amd64 package post-installation script subprocess returned error exit status 1

[Jesse Schulman]

Occurs when updating from Bionic or Eoan to Focal.
Possibly WSL related?

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: libc6:amd64 2.31-0ubuntu6
ProcVersionSignature: Microsoft 4.4.0-18362.476-Microsoft 4.4.35
Uname: Linux 4.4.0-18362-Microsoft x86_64
ApportVersion: 2.20.9-0ubuntu7.11
Architecture: amd64
Date: Tue Mar 24 11:31:47 2020
Dmesg: [ 0.004966] Microsoft 4.4.0-18362.476-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: N/A
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.3
 apt 1.6.12
SourcePackage: glibc
Title: package libc6:amd64 2.31-0ubuntu6 failed to install/upgrade: installed libc6:amd64 package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2020-03-24 (0 days ago)

[lotuspsychje (lotuspsychje)]

Thank you for reporting this bug and make ubuntu better!

Can you please check bug: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1867431

to see if you have the same symptons to make it a duplicate?

[Jesse Schulman (vitrial)]

It looks similar, but I'm not sure if it's actually the same, my report has nothing to do with sudo.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gareth Woolridge (moon127)]

I believe this is a change in libc6 2.31 now making an unsupported call in WSL which causes "sleep" to break:

https://github.com/microsoft/WSL/issues/4898

As a workaround I edited /var/lib/dpkg/info/libc6:arm64.postinst (as I was on arm64) and removed the "sleep 1" which was causing package install to fail.

Obviously that is a temporary hack, and if Focal supports WSL1 it will need to cope with that regression.

[Gareth Woolridge (moon127)]

And of course anything else on an affected system calling sleep be they scripts or packages will be similarly affected.

[Gareth Woolridge (moon127)]

Running sleep fails with:
sleep: cannot read realtime clock: Invalid argument