Public bug reported:

Binary package hint: auctex

If I run emacs -q and load the following file, ~/test.tex:

\documentclass{beamer}
\begin{document}
\begin{frame}
  $a_{b$
\end{frame}
\end{document}

and hit C-c C-c LaTeX RET, emacs says "LaTeX errors in `*~/test output'.
Use C-c ` to display."

Then I hit C-c ` and I expect one buffer called *TeX Help* to be created
containing the "Missing } inserted" error, alongside the original
test.tex buffer.

But this doesn't happen: instead, two buffers are created: one called
*TeX Help*, and a read-only buffer called Debian. Both are empty, and
the minibuffer says: Search failed: "^l\\." These two buffers replace
the test.tex buffer.

Incidentally, if I go to the new Debian buffer and hit C-x C-w, the
minibuffer says "Write file: ~/TeX Live 2009/", which I find rather
curious.

If I comment out the \begin{frame} and \end{frame} lines in test.tex,
then I do get the expected behaviour.

Version info:
$ lsb_release -rd
Description:    Ubuntu 10.04.2 LTS
Release:        10.04
$ apt-cache policy emacs23 auctex
emacs23:
  Installed: 23.1+1-4ubuntu7.2
  Candidate: 23.1+1-4ubuntu7.2
  Version table:
 *** 23.1+1-4ubuntu7.2 0
        500 http://ftp.heanet.ie/pub/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     23.1+1-4ubuntu7 0
        500 http://ftp.heanet.ie/pub/ubuntu/ lucid/main Packages
auctex:
  Installed: 11.85-1ubuntu1
  Candidate: 11.85-1ubuntu1
  Version table:
 *** 11.85-1ubuntu1 0
        500 http://ftp.heanet.ie/pub/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

** Affects: auctex (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/790212

Title:
  missing } not handled correctly: Search failed: "^l\\." and mysterious
  Debian buffer

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