I have finally managed to have a running version of cellsage server on ubuntu 12.04, thanks to the information provided by Jason Grout. The last problem concerning matplotlib not working (TclError: no display name and no $DISPLAY environment variable) i seems related to the access of sagecell-server using localhost. By accessing the sagecell server with an URL (not localhost), python graphic with matplotlib works. I am now using SageCell Server, together with WebWork and Mooolel for my online courses.
For those interested in compiling a cellsage server on Ubuntu 12.04, i have put the detailed instructions on my professional page at the my university here http://ufrmeca.univ-lyon1.fr/~buffat/sagecell.html Thanks to all the developers of Sage Marc -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/groups/opt_out.