I am blind!

Thank you Rebski for opening my eyes and reporting the error back again!
I totally missed the second error!
You guys are both missing libgnomecanvas that's also in my repository.

I'll take a look and report back in a minute...

So blind!

UPDATE: I just went to Maemo Downloads and clicked on "Click to Install" icon on the Xournal page. It installed both repositories (Maemo extras and my own), downloaded about 15Mb and it installed without any problems at all.

Uhmm... could you check if you have all the repositories (maemo extras and my own [Anidel...]) ?
If so, did you try to refresh, removed and re-installed it again ? how big it is the download with a fresh installation ?
Last, you could try to log in your tablet as root and run:

apt-get install libgnomecanvas

and tell me what does it say ?

It gives you errors try:

apt-get install -f

(always being root)