Apt command reports certificate error certificate verification failed: the certificate is not trusted

problem apt Command reports certificate error

Certificate verification failed: The certificate is NOT trusted

Treatment method

1. Change source file , Will all https Change to http：

sudo vi /etc/apt/sources.list

After the change, it is as follows ：

deb http://mirrors.zju.edu.cn/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.zju.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.zju.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.zju.edu.cn/ubuntu/ focal-security main restricted universe multiverse

2. Update source

sudo apt-get update

3. install / Renew Certificate ca-certificates

sudo apt-get install --reinstall ca-certificates

4. Refer to step 1 to change the image source file back to https
After finishing /etc/apt/sources.list The contents of the document are as follows ：

deb https://mirrors.zju.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.zju.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.zju.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.zju.edu.cn/ubuntu/ focal-security main restricted universe multiverse

5. Update the source again

sudo apt-get update

6. Now you can install the software normally .

sudo apt-get install xxxxx

reference

Unable to locate package Error resolution _ Freedom hungry blog -CSDN Blog
apt The solution to the error of command report certificate ------- Certificate verification failed: The certificate is NOT trusted._Chaowanq The blog of -CSDN Blog
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