FYI: Thanks for sharing. Tried this but it didn't work on the laptop I was trying to fix. I am guessing it is because it has a different hardware component and drivers. Anyhow, here is some info on the laptop just for information purposes in case someone wants to try this with a similar setup.
The Acer Aspire 4920 laptop, with 4GB DDR2 Memory RAM (2 x 2GB) uses Intel Integrated Graphics Media Accelerator X3100 graphics processor. The driver says its Intel Mobile GM965/GL960 with the ff. info:
Display Server: X. Org 1.18.4 drivers: intel (unloaded: fbdev, vesa)
Resolution: 1280x800@60.00hz
GLX Renderer: Mesa DRI Intel 965GM
GLX Version: 2.1 Mesa 17.2.8
Direct Rendering: Yes
This is the log info I got when trying to run Tabletop Simulator in Steam with "-log -force-opengl and -force-gfx-st" before trying this solution:
Code:
Desktop is 1280 x 800 @ 60 Hz
Unable to find a supported OpenGL core profile
Failed to create valid graphics context: please ensure you meet the minimum requirements
E.g. OpenGL core profile 3.2 or later for OpenGL Core renderer
[Vulkan init] extensions: count=1
[Vulkan init] extensions: name=VK_EXT_debug_report, enabled=0
Vulkan error VK_ERROR_INCOMPATIBLE_DRIVER (-9) file: /home/builduser/buildslave/unity/build/Runtime/GfxDevice/vulkan/VKContext.cpp, line: 279
Vulkan detection: 0
No supported renderers found, exiting
(Filename: Line: 531)
After installing the PPA drivers, I tried to even install Wine+Gallium as suggested but it didn't went well. The OS lost its desktop icons and I wasn't able to access the Terminal. But Tabletop Simulator ran, albeit really slow, under Recovery Mode up until the Main Menu screen. Creating/joining games hangs the system. Thus, I've tried uninstalling the PPA drivers and reverting to the previous system but it wreaked the Linux Mint OS and cannot boot up successfully. Now, I will just have to reinstall it.