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I was reading a lengthy document and I noticed that the fan of the pc kicked in every 60 seconds for about 2 seconds. Because it annoyed me during reading I checked what was causing it and it turned out to be caja. So I closed the caja screen and went on reading for a few seconds and it happened aga...

Well done. Now that you mentioned the solution I remembered that there also is an option in caja to set this value, caja>preferences>preview. Stupid I didnt think of it.

Thats not what I expected. Bummer. I had a look at the source code for that message 'lid device is not compliant to SW_LID' and it appears to be a warning in case of buggy firmware. Though that computer language is not really my thing this message indicates that it has sensed conflicting information...

That change wont harm. You can change it back if it doesnt work.
I think there are 2 lids defined.
Can you check that by doing:

Sorry I missed that last part with the screen shot.
Maybe this helps: and change this line #HandleLidSwitch=suspend to HandleLidSwitch=suspend
save it, reboot and try again.

It looks like your lid suspend is switched off.
Go to menu>control centre>power management and check the setting 'When laptop is closed' at the ac tab and the battery tab. if it doesnt say suspend there, set it so. If not report here.

Just to be sure, can you paste the output of this terminal command?

Open a terminal and issue this command and paste the result here.

Is mkv defined in /etc/mime.types? Is matroska defined in /usr/share/thumbnailers/xplayer.thumbnailer?

There is an rather old topic about this here: viewtopic.php?t=167208
The mint mate version has sort of the same problem.

Sorry I was very busy. Can you execute this command in a terminal cat /proc/net/wireless It will give you some stats of your wifi and the name of your wifi. Now do the command: dmesg -T | grep -i name-of-your-wifi Do you see anything strange there? If not sure, make a photograph and post it here.

You may have lost your gateway setting. If you type http://212.238.239.115/test/ in your browser, do you get a page saying "hello world'?
If not what error does it give?

According to this post there has been an bios issue with that specific lenovo model. https://askubuntu.com/questions/1028612 ... ovo-z50-70
Is the bios up to date?

Never mind the 4.15 kernel.. it doesnt install here for some reason ;(

I am a bit out of ideas. Maybe moving to the new LTS kernel 4.15.0-74.84 will solve this, otherwise try moving to 5.3.0-24 (for newer equipment, non-LTS).
The 4.15 one will be in your updates list. The 5.3 one you will have to by hand.

Dont delete them, you will break your system doing so. Those directories are used by your installed applications.

Even without cloning, just freshly installed Mint 19.3 cinnamon without windows, goes into boot loop.

Is that using the same disk?
Can you startup with a live usb and do inxi -Fzx in a terminal?

Yes, you will have to boot from a live usb. I am not familiar with fsck but I think you should not use it on a mounted volume.

According to this (german) link a simular problem was solved by doing a fsck on the disk. https://forum.siduction.org/index.php?P ... 4#msg54964

There shouldnt be a difference between reboot and shutdown. The only thing I can think of is that something went wrong in the cloning part. Depending on the cloning method you can end up with a reference to a swap partition in /etc/fstab that doesnt exist. In a terminal do: cat /etc/fstab | grep -i ...