“dpkg: warning: files list file for package ‘libpam-winbind:armhf’ missing; assuming package has no files currently installed”
The errors that you’re seeing above is normal when you try to “apt-get install” on this device because the packages has been modified by WD. It’s safe to ignore as long you didn’t remove/upgrade anything during the installations.
BUT the main “problem” is now you’re on firmware V4. You will not be able to use “apt-get install” successfully due to V4’s 64K memory page size. You’ll need to rebuild the debs patched with this new V4 requirement. See this thread for more info: [GUIDE] Building packages for the new firmware… someone tried it?
Doing a restore from WD’s Dashboard settings will not fix this, you’ll need to reflash the firmware. Download the V4 firmware manually and upgrade it from the Dashboard settings. It will not wipe your shared backups. If after the upgrade you see WD Dashboard acting weirdly, go to the settings again and do a “system” only restore. This will also preserve your shared backups.
I have MySQL installed on V4 but only after going through all the rebuild hassle. I would advise if you really want to have MySQL installed, downgrade to V3 to be able to use “apt-get install”. There’s two method, modify the upgrade script or the version file. Search this forum for details.