Compatibility Report

• Name of the game with compatibility issues: The Lord of the Rings Online
• Steam AppID of the game: 212500

System Information

• GPU: lspci | grep -i nvid says:
  01:00.0 VGA compatible controller: NVIDIA Corporation TU106M [GeForce RTX 2070 Mobile] (rev a1)
  01:00.1 Audio device: NVIDIA Corporation TU106 High Definition Audio Controller (rev a1)
  01:00.2 USB controller: NVIDIA Corporation TU106 USB 3.1 Host Controller (rev a1)
  01:00.3 Serial bus controller [0c80]: NVIDIA Corporation TU106 USB Type-C UCSI Controller (rev a1)
• Driver/LLVM version: lsmod | grep -i nvid says:
  nvidia_uvm 913408 0
  nvidia_drm 49152 14
  nvidia_modeset 1122304 33 nvidia_drm
  nvidia 19517440 1635 nvidia_uvm,nvidia_modeset
  drm_kms_helper 184320 2 nvidia_drm,i915
  drm 491520 18 drm_kms_helper,nvidia_drm,i915
  ipmi_msghandler 102400 2 ipmi_devintf,nvidia
  i2c_nvidia_gpu 16384 0
• Kernel version: Linux bree 5.3.0-23-generic #25-Ubuntu SMP Tue Nov 12 09:22:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
• Link to full system information report as Gist
• Proton version: 4.11

I confirm:

• [X] that I haven't found an existing compatibility report for this game.
• [X] that I have checked whether there are updates for my system available.

Attached (below): $HOME/steam-212500.log.

Symptoms

See error message, below.

Reproduction

Run the game from Steam, which starts the LotRO launcher. Before the came can run, the launcher downloads lots of data files and unpacks them. It is during this phase of game launch that failure happens:

PatchFlow::AdmitFailure  [ "PatchClientDLL::CheckDatFiles Failed. [Unable to decrypt and de-serialize the data downloaded from the server.]"