I have a similar problem.

Neither the gnumeric nor the addons will install properly. Trying to apt-get install them on the command line reveals that there are some unsatisfied dependencies.

I had no problem installing gnumeric in the past. Maybe I am missing some vital repo that is different from the one that gnumeric is included in.
Here is the output of an apt-get update and apt-get install gnumeric

Nokia770-26:~# apt-get update
Ign http://maemo.o-hand.com mistral/ Release.gpg
Ign http://marceloeduardo.com mistral Release.gpg
Hit http://maemo.o-hand.com mistral/ Release
Hit http://maemo.o-hand.com mistral/ Packages
Ign http://marceloeduardo.com mistral Release
Ign http://www.maemo.org.br mistral Release.gpg
Get:1 http://maemo-hackers.org mistral Release.gpg [189B]
Ign http://mg.pov.lt mistral Release.gpg
Ign http://repository.maemo.org mistral Release.gpg
Ign http://repository.maemo.org mistral Release.gpg
Ign http://downloads.kernelconcepts.de mistral Release.gpgIgn http://www.fulminati.org maemo/ Release.gpg
Hit http://marceloeduardo.com mistral/games Packages
Ign http://www.mulliner.org maemo2 Release.gpg
Hit http://www.maemo.org.br mistral Release
Ign http://bgran.net mistral Release.gpg
Ign http://hl.homelinux.org maemo/ Release.gpg
Ign http://only.mawhrin.net mistral Release.gpg
Hit http://www.maemo.org.br mistral/main Packages
Hit http://www.mulliner.org maemo2 Release
Hit http://maemo-hackers.org mistral Release
Ign http://www.fulminati.org maemo/ Release
Ign http://bgran.net mistral Release
Hit http://repository.maemo.org mistral Release
Hit http://only.mawhrin.net mistral Release
Ign http://downloads.kernelconcepts.de mistral Release
Ign http://home.ufam.edu.br binary-arm/ Release.gpg
Hit http://www.mulliner.org maemo2/free Packages
Ign http://hl.homelinux.org maemo/ Release
Get:2 http://catalogue.tableteer.nokia.com mistral Release.gpg [189B]
Get:3 http://catalogue.tableteer.nokia.com mistral Release.gpg [189B]
Hit http://catalogue.tableteer.nokia.com mistral Release
Hit http://only.mawhrin.net mistral/user Packages
Hit http://www.fulminati.org maemo/ Packages
Hit http://bgran.net mistral/user Packages
Hit http://downloads.kernelconcepts.de mistral/free Packages
Hit http://hl.homelinux.org maemo/ Packages
Hit http://catalogue.tableteer.nokia.com mistral Release
Hit http://repository.maemo.org mistral Release
Hit http://mg.pov.lt mistral Release
Hit http://mg.pov.lt mistral/user Packages
Ign http://maemo-hackers.org mistral Release
Ign http://home.ufam.edu.br binary-arm/ Release
Hit http://repository.maemo.org mistral/free Packages
Hit http://mg.pov.lt mistral/other Packages
Hit http://maemo-hackers.org mistral/main Packages
Hit http://repository.maemo.org mistral/non-free Packages
Hit http://home.ufam.edu.br binary-arm/ Packages
Hit http://catalogue.tableteer.nokia.com mistral/user Packages
Hit http://repository.maemo.org mistral/free Packages
Hit http://catalogue.tableteer.nokia.com mistral/user Packages
Hit http://repository.maemo.org mistral/non-free Packages
Fetched 191B in 3s (51B/s)
Reading package lists... Done
W: GPG error: http://maemo-hackers.org mistral Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3A312B21B9E81572
W: You may want to run apt-get update to correct these problems
Nokia770-26:~# apt-get install gnumeric
Reading package lists... Done
Building dependency tree... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
gnumeric: Depends: libgoffice-0-3 (>= 0.3.0) but it is not going to be installed
Depends: libgsf-1-114 (>= 1.14.1) but it is not going to be installed
Depends: libgsf-gnome-1-114 (>= 1.14.1) but it is not going to be installed
Depends: gnumeric-common (= 1.7.0-1indt3) but 1.7.0-1indt1 is to be installed
osso-browser: Depends: hildon-task-navigat but it is not installable
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
Nokia770-26:~#