Where are you finding it stated that libc6 2.33 is for 20.04? All the information I have places its soonest appearance in the Testing 20.10 and even then it was iffy...
Don't get me wrong. I have no qualms about being happily corrected; My intent is to help, not be right.
I wouldn't want to see anyone damage their system.
One thing we could do is load up a test rig of Zorin OS 16, install libc6 2.33 and run it through its paces and see what happens.
I think i misread, they upgraded the LTS to 21.04 ?
Yep, that's the ticket. That guide upgrades Ubuntu up to 21.04.
Kernel upgrade 5.13 and 5.14 guide
Zorin will update a kernel ?
Mx Linux and POP OS have a 15.4 checked and because i have them one on hdd next on pendrive.
Does this include the Libc6 bug?
Pop! OS is not on 15.4, heck there is not even a kernel like that. Pop! uses 5.13 and MX Linux 21 xcfe in live boot 5.10
Typo - he meant 5.14.
My Kernel.
Install kernel 5.15
sudo add-apt-repository ppa:tuxinvader/lts-mainline -y
sudo apt update
sudo apt-get install linux-generic-5.15
uname -r
Correction: Step 1: Thoroughly back up all personal data.
The kernel 5.15 is not stably tested on Zorin OS 16.
Correction: Step2: Make the entire disk image backup using either Rescuezilla or Clonezilla before attempting anything risky (like updating to the untested kernel).
Exactly! Agreed 100%
And I will tell you something else. I am not going to install any REPO on my machine that is named TUXINVADOR. 
LOL Tuxinvador is quite the expert.
And I am stupid, still aint adding it though
It was a guide posted by me for users who wanted to test and wanted to know how bourne got it installed.
I do not recommend it if you use your os daily. Only if you are testing and dont care if you need to reinstall.
Is the 5.15 kernel working alright, and is tuxinvader's repo the way to go? I have an hp envy x360 with a 5700u and I cannot have the laptop sleep on the default kernel with Zorin OS 16. If I do, I get a black screen when it tries to wake up.
I only found out about this issue from a reddit thread
AMD Has An Important Suspend/Resume Fix With Linux 5.15 - Phoronix
With Linux updates something is like a playing in casino. You can win or loose. Every time learning more. Example with new installation i created a manual partition. Why? Because I learning from people here what they put information. If something working wrong always can test something and checked if working on virtual machine. With some idea in Linux scripts this is like " a woman pregnant" - the child is a hard work a people who gived a more happiness people who using Linux.
