Looks like a driver issue. I sanitized the instructions from several sources, the person I was helping reported apparent initial success with the Realtek driver built+installed manually:
1) Make sure the system is up to date and development tools are installed: sudo apt-get update && sudo apt-get upgrade -y && sudo apt-get dist-upgrade -y sudo apt-get install --reinstall build-essential sudo apt-get install --reinstall linux-headers-generic sudo apt-get install --reinstall linux-headers-`uname -r` 2) Get the appropriate driver file from realtek.com. Its name will end with .tar.gz. The model you are looking for is RTL8191SE (NOT VA2). 3) Open a terminal, go to the folder where the file was saved: $ cd Downloads 4) Uncompress the file: $ tar -xvzf 92ce_se_de_linux_mac80211_0005.1230.2011.tar.gz 5) Change to the directory $cd rtl_92ce_92se_92de_linux_mac80211_0005.1230.2011 6) Build & install 1. Change to Super User $ sudo -s 2. Compile driver from the source code , install it to the kernel # make && make install 3. Reboot: # reboot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1000208 Title: wifi network get disconnected periodically -- Realtek RTL8191SEvA To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1000208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs