Debian 10 is somehow completely broken apt-get update / upgrade does not work

All we need is an easy explanation of the problem, so here it is.

Debian 10 is somehow completely broken apt-get update / upgrade does not work the ca-certificates do not work I try to fix it for too long now but nothing works. that’s why I hope someone can help me here. I’m new to Linux Debian and don’t know exactly what I did ._. Thank you already 😀

apt-get update

Err:2 buster Release
  Certificate verification failed: The certificate is NOT trusted. The certifica                                                                                                                                                             te issuer is unknown.  Could not handshake: Error in the certificate verificatio                                                                                                                                                             n. [IP: 443]
Reading package lists... Done
W: No system certificates                                                                                                                                                              available. Try installing ca-certificates.
W: No system certificates av                                                                                                                                                             ailable. Try installing ca-certificates.
E: The repository ' buster Release' no longer has a                                                                                                                                                              Release file.
N: Updating from such a repository can't be done securely, and is therefore disa                                                                                                                                                             bled by default.
N: See apt-secure(8) manpage for repository creation and user configuration deta   ```                                                                                                                                                          

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

The problem is not with Debian. It’s with That’s a 3rd party repository.

First, ensure that your buster installation (without the PHP stuff) is good and will handle certificates:

sudo mv /etc/apt/sources.list.d/php.list{,.bak}
sudo apt update
sudo apt install apt-transport-https ca-certificates curl

Next, if (and only if) you trust the source, then restore php.list and get the latest signature:

sudo mv /etc/apt/source.list.d/php.list{.bak,}
sudo wget -O /etc/apt/trusted.gpg.d/php.gpg
sudo apt update

Edit: It sounds like you’ve lost your main Debian archive source. re-create it with:

echo "deb buster main" | sudo tee -a /etc/apt/sources.list

then try again

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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