I got a errorno -5 in the Ubuntu 20.04 installer. How do I fix it?

Since you don't tell us what hardware you're trying to install onto, and what you were doing when that error happened, or what you're installing from, we can't tell you much. If it's an error 5 (not "-5"), that can be disk related, or related to a bad ISO image.

Since you're 'experienced' with Linux, you should know how to verify the md5 sum on the downloaded image, and the different ways to burn it to media.

Hardware is:
AMD Radeon R3 APU
HDD: BHT WR202I0064G E70245F5 (SATA+ATA 3.0Gbps) (Ubuntu thinks this SSD is failing)
HP Stream Laptop Model 14-ds0013dx
It is "The installer reported a error: errno -5 (Input/output error)"

And back to, "Did you verify the downloaded ISO md5 sum? What did you burn it to?"

And did you check the disk? Have permissions? Booting/installing to a VM or a 'real' system? Dual-booting?? Lots of things you're not saying here, all of which can apply...an 'experienced' user should be able to provide these things.

You might consider downloading the ISO image via torrent rather than via http if the distro's developers offer that option of course (or someone else does that can be considered a "trusted source").

Because if you download the ISO via torrent, the drive space it'll take up is reserved in advance by the client. The data is also checked for consistency to make sure each part of the ISO image has downloaded properly AFAIK. Therefore it's less likely you'll end up with a bad downloaded image.

The problem with downloading the image via http is that it's not only slower (particularly if your internet connection isn't great/fast), AFAIK the drive space it'll take up isn't reserved in advance. Therefore not all of the file will necessarily be stored in consecutive sectors on the drive, therefore the drive has to work harder with more chance of problems.

In any case, TB0ne is correct, you should be checking the checksum of the image before trying to burn/write it to media.

I appreciate what my friend jsbjsb write! It works better with torrent. It is much safer. http is not safe.
I instyalled ubnuntu with torrent, works very well!

This doesn't address the OP's question at all, and what you posted makes little sense. A torrent versus a direct download from the producers site should be IDENTICAL; that's the entire purpose of verifying the md5 checksum. Also, if you're booting from optical media, speed of the burn is also a factor.

And your post doesn't acknowledge the other items, such as how they're installing, to what, dual/single boot, etc.

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