I would like to install Linux on my tablet. It has Cortex A9 processor (RockChip RK2928), 512MB RAM and 4GB internal memory. My question is: is there any Linux distro that would work on it? I tried to google but didn't find anything that would help me. Thanks.
Take a look at this: https://wiki.ubuntu.com/Touch/Devices
Maybe your tablet is on the list of supported devices
If your tablet came with Android installed, the place to start looking is the XDA site. There are all sorts of patches and mods there, and, depending on the exact model of your tablet, somebody might have ported a Linux distro to it. Some tablets even allow dual boot, others can't be modified at all (that is, there is no known way to root them).