Netboot Loading libc6-udeb failed for unknown reasons (focal)

[Zippy Zebu]

With the netboot image from march 10 (http://archive.ubuntu.com/ubuntu/dists/focal/main/installer-amd64/current/images/netboot/) it shows me following error at partition disk space step

          ???????????????????? [!!] Detect disks ?????????????????????
          ? ?
          ? Failed to load installer component ?
          ? Loading libc6-udeb failed for unknown reasons. Aborting. ?
          ? ?
          ? <Go Back> <Continue> ?
          ? ?
          ????????????????????????????????????????????????????????????

This has also confirmed in the comment https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1817358/comments/41

[Launchpad Janitor (janitor)]

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

[Jane Atkinson (irihapeti)]

New release of boot.img (17 March) is working correctly.

[Launchpad Janitor (janitor)]

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

[Alexander Dangel (nhadangel)]

Yesterday new installs with the actual mini.iso were working.
Today the Bug is there again.

Is it ok to submit this issue here?
Or should we open a new bug?

[milan92stankovic (milan92stankovic)]

I can confirm that the bug is back. I have issues with Ubuntu 20.04 workstations deployment since this morning.

[mike (xazes123)]

Can confirm. Netinstall breaks on ubuntu 20.04 with lib6c-udeb

[Eric Mergelsberg (emergelsberg)]

Hello Everybody,

we can confirm this issue as well.
Our unattended installation is breaked since today (last night) and will ended up with the same error message:

loading libc6-udeb failed for unknown reasons

[discots (discots)]

+1

[christopheg (christophe-grosjean)]

Same here it completely breaks our automated install process. It worked yesterday and it's broken sinc a fex hours. It doesn't seem related to netboot.iso image itself but to some external component loaded by netinstall. Is there a way to force the version of the additional components used ?

[Roman Dyadyushkin (apomelitos)]

Apr 27 12:58:02 anna[7607]: (process:7672): sh: error while loading shared libraries: __vdso_gettimeofday: invalid mode for dlopen(): Invalid argument

[Eric Mergelsberg (emergelsberg)]

For all in this thread:
If anyone is doing a unattended installation by providing a preseed configuration, you can use the following workaround as long as ubuntu has not published a fix for this topic:

d-i preseed/early_command string sed -i -e '/Package: libc6-udeb/{N;N;s/Version: 2.31-0ubuntu9.*/Version: 2.31-0ubuntu9.3/}' /var/lib/dpkg/status;

[Malte Schmidt (maltris)]

Can confirm, rolled back my repository from one week ago, worked fine back then.

[christopheg (christophe-grosjean)]

Thanks to Eric Mergelsberg. I confirm the workaround is working fine. I
added the magic line below in may preseed.cfg and my unattended install is
back to working for now.

d-i preseed/early_command string sed -i -e '/Package:
libc6-udeb/{N;N;s/Version: 2.3.*/Version: 2.31-0ubuntu9.3/}'
/var/lib/dpkg/status;

Le mar. 27 avr. 2021 à 16:16, Malte Schmidt <email address hidden> a
écrit :

> Can confirm, rolled back my repository from one week ago, worked fine
> back then.
>
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> You received this bug notification because you are subscribed to the bug
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> https://bugs.launchpad.net/bugs/1867502
>
> Title:
> Netboot Loading libc6-udeb failed for unknown reasons (focal)
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[Brian Orange (orange.brian)]

This is occuring for me as well, is three anyway to work around it without generating preseed configuration? Perhaps something I can do from the command line with a vanilla mini.iso?

[City of Oz (ozinfotech)]

Like @orange.brian, I'm not familiar with preseeding either and am getting the same lib6-udeb error message. Is there a simple workaround?

[Erik Kristensen (unhandledexception)]

I can also confirm this is broken.

[Brian Orange (orange.brian)]

@ozinfotech I believe it's possible to bring in a preseed config at runtime without going thru the whole preseeding process of modifying the iso. I wasn't able to figure it out in the short amount of time I have to work on it.

[christopheg (christophe-grosjean)]

For those not using preseed, the above trick is also working. They just have to open a command line from the installer before updates (did it just before the network detection) and apply the sed command:

sed -i -e '/Package:
libc6-udeb/{N;N;s/Version: 2.3.*/Version: 2.31-0ubuntu9.3/}'
/var/lib/dpkg/status

This will trick a system which has version 2.31 of libc6-udeb to believe it have 2.31-0ubuntu9.3 (more up to date than the broken online version), thus not updating it.

They you just exit from the command line and proceed with the installation as usual.

[Volodymyr Rybak (vvraqua)]

Added the line to my kickstart

preseed preseed/early_command string "sed -i -e '/Package: libc6-udeb/{N;N;s/Version: 2.31-0ubuntu9.*/Version: 2.31-0ubuntu9.3/}' /var/lib/dpkg/status;"

but not working

[christopheg (christophe-grosjean)]

Hi Volodymyr.

You may be in the same case I was. My default version of libc6-udeb was not 2.31-0ubuntu9 but just 2.31. If this is the case the sed line you used won't work. That's why I modified it to:

sed -i -e '/Package:
libc6-udeb/{N;N;s/Version: 2.3.*/Version: 2.31-0ubuntu9.3/}'
/var/lib/dpkg/status

which should work in both cases.

[Volodymyr Rybak (vvraqua)]

Changed the line, doesn't work.

[Nils Büchner (n.buechner)]

In case someone needs a fixed initrd: https://p.haxxors.com/initrd.gz

[City of Oz (ozinfotech)]

I tried the sed command and was left with this error:
sed: unmatched '/'

I typed it several times just to be sure that I was getting it right.

[City of Oz (ozinfotech)]

Not sure what happened, but it seems to be working now even with that error message.

[Brian Orange (orange.brian)]

I can confirm, netboot install is now working again and without an error.