libapache2-mod-gnutls has issues with firefox and long POST data

When trying to send a mail via a horde served using GnuTLS using firefox, it often tries to save the compose.php file, especially if the SSL certificate is large (either due to 2048 bit key size, or due to having many SubjectAltNames).

This problem has been fixed upstream in 0.5.6:

** Version 0.5.6 (2010-03-24)
- Corrected issue with firefox and long POST data (by
  handling EINTR and EAGAIN errors in read).

However, 10.04 (LTS) still has only 0.5.5

# lsb_release -rd
Description: Ubuntu 10.04.1 LTS
Release: 10.04
# apt-cache policy libapache2-mod-gnutls
libapache2-mod-gnutls:
  Installed: 0.5.5-1
  Candidate: 0.5.5-1
  Version table:
 *** 0.5.5-1 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid/universe Packages
        100 /var/lib/dpkg/status