So, the driver was previously unsigned, then signed and included in the
original Ubuntu kernel for 18.10, then subsequently unsigned during an
update somewhere along the way?

That doesn't make sense to me - would have to try and find upstream to work out 
what has happened.
Larry Finger suggests that Realtek has rewritten the driver and his GitHub repo 
is only for older kernels that do not already ship the r8822be driver. 4.21 is 
quoted as when this new driver will drop.

** Bug watch added: #408

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  RTL8822BE WiFi Disabled in Kernel 4.18.0-12

Status in linux package in Ubuntu:

Bug description:
  ===SRU Justification===
  Realtek 8822be doesn't work under kernel lockdown.

  Add r8822be.ko to signature-inclusion, so it can be signed and be loaded
  when lockdown is enabled.
  Since I can't signed the kernel so it's not tested.

  [Regression Potential]
  Low. The driver is maintained by a Realtek guy, so bugs are actually
  getting fixed.

  ===Original Bug Report===
  Received kernel patch 4.18.0-12 today on my machine. On reboot my WiFi 
appears to be unavailable.
  lspci still recognises the installed RTL8822BE card and a reboot back to the 
previous kernel version (4.18.0-11) seems to resolve the problem.

  We tried some debugging in the IRC channel and didn't get very far.
  The r8822be module alias is intact, trying to modprobe it or insert
  results in a "operation not permitted" error. Modprobing mac80211 and
  cfg80211 which r8822be depends on did not seem to help.

  KMod Lists for -12 and -11 kernels:

  `ls -latr /lib/modules/4.18.0-12-*/ ; grep -i B822 
/lib/modules/4.18.0-12-*/modules.alias` :

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-11-generic 4.18.0-11.12
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
   /dev/snd/controlC1:  callum     2989 F.... pulseaudio
   /dev/snd/controlC0:  callum     2989 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Mon Dec  3 19:27:16 2018
  InstallationDate: Installed on 2018-11-10 (22 days ago)
  InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
  MachineType: LENOVO 90H90015UK
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-11-generic 
root=UUID=d5f81e09-382c-4759-8a6d-2503fe6959b4 ro quiet splash vt.handoff=1
   linux-restricted-modules-4.18.0-11-generic N/A
   linux-backports-modules-4.18.0-11-generic  N/A
   linux-firmware                             1.175.1
  SourcePackage: linux
  StagingDrivers: r8822be
  UpgradeStatus: No upgrade log present (probably fresh install) 06/15/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: O3FKT26A 36E1
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN 3259620440547
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrO3FKT26A:bd06/15/2018:svnLENOVO:pn90H90015UK:pvrLegionY720T-34ASU:rvnLENOVO:rn36E1:rvrSDK0J40709WIN3259620440547:cvnLENOVO:ct3:cvrNone: Legion Y720T-34ASU 90H90015UK
  dmi.product.sku: LENOVO_MT_90H9_BU_LENOVO_FM_Legion Y720T-34ASU
  dmi.product.version: Legion Y720T-34ASU
  dmi.sys.vendor: LENOVO

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