serious problem when upgrading. *** failed to import extension hgext.qct: No module named qct

[Uwe Brauer]

Hi

I am on Kubuntu 14.04 and used till yesterday hg 4.0
which was provided by




However last night I upgraded to 4.1.1 and run into several problems.

So I wanted to return to version 4.0-rc.

So I cloned
https://selenic.com/repo/hg

Run make local
run ./hg up 4.0-rc

Compiled and installed, and indeed it seemed that
hg is back, however now I see
hg --version
*** failed to import extension hgext.qct: No module named qct
Mercurial Distributed SCM (version 4.0-rc)

And for example in emacs, the modline does not show the correct version
number but instead this annoying message.

I commented all my extensions out, but that did not help.

What is this extension.

What can I do to repair my broken mercurial installation.

I already wrote Sean you updated the 

http://ppa.launchpad.net/mercurial-ppa/releases/ubuntu/

To 4.1.1

@ Sean if you read this, can you send me please the old workin 4.0-rc.deb?

To all the others:

What can I do now? Why is mercurial broken?

Thanks

Uwe Brauer