I interrupted a routine software update that was hanging, and as a result my Ubuntu 15.10 has lost a lot of general system functionality, e.g. it will no longer write files to USBs, play sounds or detect WiFi. I'm guessing there are more issues I haven't yet had the time to notice.
I'm going to replace the distro with Ubuntu 16.04 (and have already backed up all my files in preparation).
Given that the current system seems to be corrupted/faulty, should I choose the erase and reinstall option when installing the new Ubuntu 16.04, or the upgrade, such that it keeps programs and files? Would the latter option cause it to retain the issues that made the last one malfunction?