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From where?

Are you using the Application Manager on your tablet? It should take care of all that stuff. Maybe you can give us the steps you used to do the installation.

I have both of these apps successfully installed on my N810, so it beats me!

Are you sure you aren't trying to install the maemo5 (N900) version?
Are you sure you have enabled the maemo4/diablo repos?
What "apt-cache showpkg mplayer" says? Version should be 1.0rc1-maemo.29.n8x0

several of the repos have had issues in the last few days.. I'd open app manager and check for updates as best you can. You might have issues with checking for update since some of the repos have moved and apt-get doesn't follow "301 Permanently Moved". see http://talk.maemo.org/showthread.php...647#post569647

libdbus-1-3 is on repository.maemo.org and catalogue.tableteer.nokia.com

Package: libdbus-1-3
Versions:
1.0.2-0osso14 (/var/lib/apt/lists/catalogue.tableteer.nokia.com_updates_diablo-2_._Packages) (/var/lib/dpkg/status)
Description Language:
File: /var/lib/apt/lists/catalogue.tableteer.nokia.com_updates_diablo-2_._Packages
MD5: a5a0e201e902ff4a8f9032b86dbb0182

1.0.2-0osso12fix (/var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_dists_chinook_free_binary-armel_Packages
MD5: a5a0e201e902ff4a8f9032b86dbb0182

hello,
i have also problems with upgrading several apps like ATI-I5, omweather, vnc-viewer, x-chat, ...
i fixed missing pgp keys but the program-manager still complained about missing actual libraries, like libglib2.
i tried to update with apt-get, it fetched the lists but when i try to do an apt-get upgrade, i see that 32 packages are hold back. if i try to install them manually i see lots of missing dependencies.
is there something wrong with the repositories? i used to be able to make upgrades without any errors.

these are my sources:
deb http://catalogue.tableteer.nokia.com/updates/diablo-2/ ./
deb http://www.aeracode.org/maemo/2008 ./
deb http://maemo.vivaphp.net/dists/chinook ./
deb http://armin-warda.de/maemo diablo user
deb http://austinche.name/maemo chinook/
deb http://browser-extras.garage.maemo.org/browser-extras/ chinook browser-extras
deb http://openbossa.indt.org.br/carman/repo/release all user
deb http://packages.collabora.co.uk/maemo chinook haze salut idle
deb http://packages.collabora.co.uk/maemo diablo user
deb http://maemo.daylessday.org/repo chinook user
deb http://www.devicescape.com/download/debian/ chinook user
deb http://repository.maemo.org/extras/ diablo free non-free
deb http://packages.gizmoproject.com/chinook chinook user
deb http://repository.innologies.com/ chinook user
deb http://jalimo.evolvis.org/repository/maemo/ chinook user
deb http://www.mulliner.org/nokia770/repository/ chinook free
deb http://maemocjk.garage.maemo.org/ chinook test
deb http://repository.maemo.org/extras/ fremantle free non-free
deb http://maemo-hackers.org/apt chinook main
deb http://repository.maemo.org/ diablo/tools free
deb ftp://foolab.org/pub/apt chinook spell arabic main
deb http://www.mollux.org/maemo chinook user
deb http://catalogue.tableteer.nokia.com/certified/ chinook user
deb http://catalogue.tableteer.nokia.com/non-certified/ chinook user
deb http://maemo.o-hand.com/packages/ chinook/
deb http://qole.org/repository maemo main
deb http://wardenclyffetower.com/maemo chinook user
deb http://p.quinput.eu/debfarm chinook user
deb http://www.gbiloba.org/debs/ bora free
deb http://maemo.lancode.de chinook user themes
deb http://repository.maemo.org/extras/ chinook free non-free
deb http://corporatism.org/repo/ diablo free
deb http://people.debian.org/~tschmidt/maemo/chinook/ ./
deb http://tuomas.kulve.fi/debian chinook maemo
deb http://repository.maemo.org/ chinook free non-free

lazart, you have way too many repositories enabled, and at least one of them is a freemantle repo, so no wonder you have trouble.