Simon Naunton, it will help immensely if you filed a new report with the Ubuntu 
repository kernel (not mainline/upstream) via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

For more on why this is helpful, please see
https://wiki.ubuntu.com/ReportingBugs.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1528005

Title:
  10ec:8821 rtl8821ae has no connectivity in 5GHz networks

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Attempting to connect to a ASUS Wireless Router RT-AC51U (firmware
  3.0.0.4.378_9135-gac2b2c2on) on 5GHz I get an IP address and
  everything, but no connectivity. I cannot ping the router.

  WORKAROUND: Execute via a terminal:
  git clone https://github.com/lwfinger/rtlwifi_new.git
  cd rtlwifi_new
  sudo make install
  sudo restart now

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.3.0-2-generic 4.3.0-2.11 [modified: 
boot/vmlinuz-4.3.0-2-generic]
  ProcVersionSignature: Ubuntu 4.3.0-2.11-generic 4.3.0
  Uname: Linux 4.3.0-2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mikaela    1567 F.... pulseaudio
   /dev/snd/controlC1:  mikaela    1567 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sun Dec 20 16:01:13 2015
  HibernationDevice: RESUME=UUID=431ec214-73ef-4058-b283-5721bb5a45d2
  InstallationDate: Installed on 2015-12-12 (7 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 
(20151212)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp.
   Bus 001 Device 006: ID 13d3:3414 IMC Networks
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550JX
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-2-generic.efi.signed 
root=UUID=ab0e7270-40bc-4a68-a541-59fd96690354 ro rw acpi_osi=
  RelatedPackageVersions:
   linux-restricted-modules-4.3.0-2-generic N/A
   linux-backports-modules-4.3.0-2-generic  N/A
   linux-firmware                           1.154
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Tiedostoa tai hakemistoa ei ole: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/07/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550JX.204
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550JX
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX550JX.204:bd05/07/2015:svnASUSTeKCOMPUTERINC.:pnX550JX:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JX:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550JX
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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