This problem doesn't concern Pd only, but it started through Pd (well, I started it) and it is related to Pd, so I'm posting it here.
I've recently dual booted my laptop with Debian Jessie XFCE and in general all is working fine. While doing some stuff in Pd (that's 0.46.2 from the Jessie repositories) I created a [text2d] and got this error message:
[text2d]: cannot find font-file '/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf'

So I looked in /usr/share/fonts/truetype and saw there was a dejavu/ directory, which had some font files in it, including DejavuSans.ttf. Now, not being very linux-savvy, I changed the name of the directory to ttf-dejavu/. [text2d] worked fine, but ever since, when I open Pd, I get this message:
WARNING: Font family 'DejaVu Sans Mono' not found, using default (Courier 10 Pitch)

I tried to rename the directory back to dejavu/, but now the corresponding font file is a "broken symbolic link to ../dejavu/DejaVuSansMono.ttf"

Renaming the directory back to ttf-dejavu/ doesn't work for [text2d] either.
It's a bit annoying because Pd's font is now quite small, and even if I include the -font-size-12 flag in the Startup flags, if I open an existing patch, the font goes back to 10, and the letters are quite small. I now realize that this wasn't a very smart thing to do, but I did it...
All this might make sense to people who know the Linux system well, but that's not the case with me and I'm experimenting. So, anyone knows a solution to this? It would be nice if I could solve both  problems, Pd not finding DejavuSansMono.ttf and [text2d] not finding DejavuSans.ttf

Thanks