Toshiba satellite L875D series includes model numbers L875D-S7210, L875D-S7230, L875D-S7232, L875D-S7332, L875D-S7342 & L875D-S7343.
I own a L875D-S7232 ( quad core AMD A8-4500M ).
This applies to Realtek 8188CE (& I believe 8192CE) wireless adapter.
I installed Ubuntu 12.04.1 x64 on the S7232 to triple boot with Windows 7 & Windows 8. The install went fine, my laptop was connected by ethernet during the install. Upon first ubuntu bootup in unity 3D, I noticed that the expected wifi networks were visible (I did not however attempt to connect to a wifi network at this point).
Then the update manager identified 200 odd packages that needed updating. Upon running the updates all my wifi options in the network-manager applet disappeared. The wired connection was still working fine but no wifi choices were available.
Using a combination of this UbuntuForums thread & this Realtek driver site I was able to restore the wifi features. Thank you chili555 & Zippy777
Download the compressed tarball from Realtek's site, then do below:
Reboot, and you should have your wifi options back. The README file in the package also lists "make uninstall", this will uninstall the wifi options.
tar zxvf <name-of-downloaded-pkg>
If you are wondering whether Toshiba offers any Linux drivers/support, see the attached screen shot