Fresh ubuntu installation and sagemath ppa (but the sage 15.04 binary does the same) I wonder why is this ?
Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
/usr/lib/sagemath/local/lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /usr/lib/x86_64-linux-gnu/libproxy.so.1)
Failed to load module: /usr/lib/x86_64-linux-gnu/gio/modules/libgiolibproxy.so
/usr/lib/firefox/firefox: /usr/lib/sagemath/local/lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /usr/lib/firefox/firefox)
^C[I 21:13:23.057 NotebookApp] interrupted
Serving notebooks from local directory: /home/riri
0 active kernels
The IPython Notebook is running at:
http://localhost:8888/Shutdown this notebook server (y/[n])? y
Any help welcome