kry@Edelweiss:~/Mail$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree... Done
Calculating upgrade...Done
The following packages have been kept back:
  libedataserver1.2-dev libkrb5-17-heimdal sasl2-bin xfce4-terminal
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
kry@Edelweiss:~/Mail$ sudo apt-get install libedataserver1.2-dev
Reading package lists... Done
Building dependency tree... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
  libedataserver1.2-dev: Depends: libnspr4-dev but it is not going to be installed
E: Broken packages
kry@Edelweiss:~/Mail$ sudo apt-get install libedataserver1.2-dev libnspr4-dev
Reading package lists... Done
Building dependency tree... Done
The following packages will be REMOVED
  libcamel1.2-6 libedataserver1.2-4 libnspr-dev libnspr4
The following NEW packages will be installed
  libnspr4-dev
The following packages will be upgraded:
  libedataserver1.2-dev
1 upgraded, 1 newly installed, 4 to remove and 3 not upgraded.