Update: I switch from ubuntu to Manjaro, using kernel 4.2.2 Huray I am not doomed to be using older kernel such as 3.13 forever.
Here are some additional information aboud neworking card $ lspci -k .... 02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01) Subsystem: Lenovo Device 0611 Kernel driver in use: wl Kernel modules: bcma, wl 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01) Subsystem: Lenovo Device 5100 Kernel driver in use: rtsx_pci Kernel modules: rtsx_pci and the driver https://bbs.archlinux.org/viewtopic.php?id=145884 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1471238 Title: BCM43142 will stop working when signal is below 55% To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1471238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs