[SOLVED] - wget fails with certificate error for github

[themetman]

I am using Linux Mint 20.1 on my PC (fully up to date).
Using this command:

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wget https://github.com/backdrop/backdrop/releases/download/1.19.0/backdrop.zip

I get this error:

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--2021-05-18 07:18:23--  https://github.com/backdrop/backdrop/releases/download/1.19.0/backdrop.zip
Resolving github.com (github.com)... 140.82.121.4
Connecting to github.com (github.com)|140.82.121.4|:443... connected.
ERROR: cannot verify github.com's certificate, issued by ‘CN=DigiCert High Assurance TLS Hybrid ECC SHA256 2020 CA1,O=DigiCert\\, Inc.,C=US’:
  Unable to locally verify the issuer's authority.
To connect to github.com insecurely, use `--no-check-certificate'.

It works fine with the

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--no-check-certificate

option. It works on my Laptop also running Mint 20.1 without an error.
I have tried this:

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sudo apt install --reinstall ca-certificates

and this:

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sudo update-ca-certificates -f

But to no avail.
Any ideas on how to fix this?

[themetman]

I solved this by using Timeshift.
I decided to use Timeshift to go back and see when the error had crept in.
I went back by days and weeks to 2021-05-02 before the problem cleared.
I then upgraded the system and all is well now, I have no idea what happened to cause the problem, but I also had ssl problems trying to update my Backdrop Websites locally.

All fixed.

[vhar]

Create ~/.wgetrc file and add to it
ca_certificate=/etc/ssl/certs/ca-certificates.crt
Enjoy!