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Ok, thank you so much. I hope this will end all the wifi problems I've met since moving from Win7 to Linux Mint.

Thanks, Kelebek! My 5 GHz wifi is working again with full speed with your advice. After installing the package from your ppa repository I noticed a new update recommendation in the Update Manager: "rtl8821ce to version 5.5.2.1. 0ubuntu-18.04.1 - Dkms source for the realtek 8821c pcie wifi drive...

Output of 'dkms status' 8812au, 4.2.3, 4.15.0-64-generic, x86_64: built 8812au, 4.2.3, 4.15.0-66-generic, x86_64: installed 8812au, 4.2.3, 4.15.0-76-generic, x86_64: installed 8812au, 4.2.3, 4.15.0-88-generic, x86_64: installed rtl8821ce, 5.5.2.1, 4.15.0-88-generic, x86_64: installed Output of 'apt ...

Latest update to linux-firmware 1.173.15 and rtl8821ce-dkms-driver killed the 5G connection of my wifi. The 2,4 GHz connection is still working. I can live with that, but I lost more than 50% of my earlier connection speed
Similar problems? Correction hints?

Final (hopefully) comment concerning my earlier wifi problems with Realtek RTL8821CE driver: latest update to kernel version 4.15.0-76 was again successful and my Wifi is still working fine!

Nice notice again: kernel update to version 4.15.0-74 successful and wifi still working fine! No hesitation anymore with kernel updates in the future!

I just noticed a new kernel update to version 4.15.0-72 in Update Manager. After some hesitation (bad experience earlier) I decided to run it. And now I'm happy to tell that my wifi is still working fine!

I just noticed a new update of rtl8821ce-dkms-driver in the Update Manager. And running it solved the problem, yippeee!
Now I'm wondering, should I skip all the kernel updates in the future?

Same result:

I already ran all those commands in the same order as you advised and rebooted, but no help. I posted first back the result of last command because there seems to be a problem: ’command not found’.

And here are results for first commands: ~/rtl8821ce$ sudo ./dkms-remove.sh About to run dkms removal steps... ------------------------------ Deleting module version: v5.5.2_34066.20190614 completely from the DKMS tree. ------------------------------ Done. Finished running dkms removal steps. ~/rtl8...

The last command gave as result:

~/rtl8821ce$ sudo ./dkms-install
sudo: ./dkms-install: command not found

I now followed the instsructions that Larry recommended first in this chain. And here are the restults: sudo apt-get install git dkms build-essential: build-essential is already the newest version (12.4ubuntu1). dkms is already the newest version (2.3-3ubuntu9.7). git is already the newest version (...

Result of dkms status:

Sorry guys (JeremyB & kelebek333), following your recommendations did not help. Earlier the tip sent by kelebek333 (using ppa repository) fixed the problem and my wireless was fully working for several weeks. But then accepting the kernel update few days ago killed it again... which I regret now.

Result: cat /var/lib/dkms/rtl8821ce/v5.5.2_34066.20190614/build/make.log DKMS make.log for rtl8821ce-v5.5.2_34066.20190614 for kernel 4.15.0-70-generic (x86_64) la 16.11.2019 11.53.43 +0200 make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.15.0-70-generic/build M=/var/lib/dkms/rtl8821ce/v5.5.2_34066...

I tried it already with no help. This was the result: About to run dkms install steps... Error! DKMS tree already contains: rtl8821ce-v5.5.2_34066.20190614 You cannot add the same module/version combo more than once. Kernel preparation unnecessary for this kernel. Skipping... Building module: cleani...

Kernel upgrade killed my wifi again yesterday. I repeated the commands of your tip with no help. My system is 19.1 Tessa. The wifi driver disappeared also at the listing of inxi -Fxz. More tips?

Thanks for this tip, kelebek333, I had same problem with HP laptop/rtl8821ce. Now my wifi is fully working!