Wifi on Ubuntu Desktop

wireless networks: device not ready (firmware missing).

sudo apt-get update
sudo apt-get install firmware-b43-installer (OR firmware-b43-lpphy-installer) 

This will install the firmware needed to make Broadcom wireless card work.

Also make sure which wireless card is present.
 (Use lspci to find, in my case
Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY)

Hide User Account on Windows logon

under this registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList

match the exact user account name,
and the value is one of the following (Decimal format)
0 – Hides the user just from the welcome screen
1 – The user is shown

Mic not working on Ubuntu 12.04

reinstall/install PulseAudio Volume Control (pavucontrol) (volume control tool (mixer) for the PulseAudio sound server)

sudo apt-get update
sudo apt-get install pavucontrol