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

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

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

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

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?

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

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

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

+1

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 ?

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

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;

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

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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> https://bugs.launchpad.net/bugs/1867502
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> Netboot Loading libc6-udeb failed for unknown reasons (focal)
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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?

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

I can also confirm this is broken.

@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.

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.

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

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.

Changed the line, doesn't work.

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

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.

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

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