You are absolutely right that I probably missed something. I lack both knowledge and experience of the Linux environment as I am a beginner (since a week or two). My intention was to try to simplify the case, but it apparently had the opposite effect. Sorry about that!
Hope the following is clearer.
I use a laptop, thus a desktop environment, where I downloaded a folder with a portable version of software to manage files from a cloud service. In this case, Icedrive.
Icedrive writes the following on its website about the software: "Full-Featured Portable App
Take Icedrive with you wherever you go - On any operating system!
No feature has been overlooked - Easily upload and download files and folders, stream your media with a built in media player, preview all popular document formats and view your images without having to download. "
I start the portable software via the following script.
cd ~ / Downloads
cd Icedrive \ Portable /
chmod + x ./Icedrive
./Icedrive --no-sandbox
The original script also contains the following line (line 2). Which extracts the files from a zip file.
“unzip Icedrive_Portable_Linux-x64.zip”
The software starts up and works but with the following terminal errors.
Fontconfig error: Cannot load default config file
[3749: 0305 / 094834.260100: ERROR: buffer_manager.cc (488)] [.DisplayCompositor] GL ERROR: GL_INVALID_OPERATION: glBufferData: ← error from previous GL command
[3749: 0305 / 094834.518563: ERROR: buffer_manager.cc (488)] [.DisplayCompositor] GL ERROR: GL_INVALID_OPERATION: glBufferData: ← error from previous GL command
The support’s response to that error message was as follows.
"Seems to be a hardware acceleration error, try this:
xorg - How to disable Hardware Acceleration in Linux? - Unix & Linux Stack Exchange "
Which I have not yet looked at, as I was focused on trying to find a solution for the startup in a smoother way e.g. via an icon or similar.
(Irrelevant in the case but as an example of a better solution, which I also use is Tresorit which installs a virtual hard drive on the laptop, which is so much easier to use.)
I got support from the support step by step to test according to what I was trying to describe with my post.
Namely as below
step 1 (original line to change with add-on)
./Icedrive --no-sandbox
step 2 (supplement with “extension GLX”)
./Icedrive --no-sandbox -extension GLX
step 3 (addition of “full path” together with “extension GLX”)
/ Full path / Icedrive --no-sandbox -extension GLX
Step 4 (a new proposal for a solution as none of the above worked, assuming that Clear Linux was missing the usual packages)
Try installing all the GUI packages like X11
There I definitely latched on to the latter package proposal. Then I do not know how it would go, or if it is even possible or appropriate to try it.