How can I change file permissions on Jelly Bean? My rooted Galaxy Nexus is on Jelly Bean (4.1.1) with a super user application. I want to install sinhala font into the phone, and for that I've tried to copy the font file (droidfallbackcens.ttf) to the font folder in my phone using the root explorer app. But it says that I have only read permissions on my phone.

I have googled this issue and tried several methods (most of those methods were about ICS), but I haven't been able to change file permissions to get "read write execute", can anyone help me with this?
You may need to remount your file system to enable write. I'm not sure how that's done with Root Explorer, but from the Terminal it looks something like:

mount -o rw,remount /partition/name/


You can get the partition name by typing mount without any parameters.