The package source of the Raspberry Pi is connected to the official source by default, and the speed is not very fast. We can replace it with a third-party source to improve the download speed and experience.
First, lsb_release -agetbullseye
pi@Rpi4B2G:/etc/apt $ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
1. Back up source files
Run the command to back up the source files of the current system
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo cp /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.bak
2. Modify the source file
To edit sources.listthe file run the command:
sudo vi /etc/apt/sources.list
Replace the content of the file with the address of Tsinghua source:
deb [arch=armhf] http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ bullseye main non-free contrib rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ bullseye main non-free contrib rpi
Save and exit the editor.
To edit raspi.listthe file run the command:
sudo vi /etc/apt/sources.list.d/raspi.list
Delete all content and replace the content of the file with the address of Tsinghua source:
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ bullseye main
3. Update package cache
Run the command:
sudo apt update
This will update the package index file from the Tsinghua source, pull the package version information, and then install or uninstall the software will use the Tsinghua source.
Run the command:
sudo apt upgrade
This will pull the latest package information from Tsinghua source, check the version of the installed package in the system, and prompt to update the updateable package.
Through the above steps, we have successfully changed the software source of the Raspberry Pi bullseye system to Tsinghua source. At this time, the download speed of the software package will be very fast, and it can ensure higher connectivity in the domestic network environment. Better user experience.
4. Restore the software source
Just overwrite the backup sources.list.bakfile back to the original location, and then run sudo apt updateupdate cache.
Enter the command to delete the source file:
sudo rm /etc/apt/sources.list
sudo rm /etc/apt/sources.list.d/raspi.list
Enter the command to restore the backup source file:
sudo cp /etc/apt/sources.list.bak /etc/apt/sources.list
sudo cp /etc/apt/sources.list.d/raspi.list.bak /etc/apt/sources.list.d/raspi.list
5. Troubleshooting
In the process of updating the list, sometimes the following error will appear
pi@Rpi4B2G:/etc/apt $ sudo apt update
Get:1 https://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian bullseye InRelease [15.0 kB]
Hit:2 http://archive.raspberrypi.org/debian bullseye InRelease
Err:1 https://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian bullseye InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9165938D90FDDD2E
Reading package lists... Done
W: GPG error: https://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian bullseye InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9165938D90FDDD2E
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian bullseye InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
This error indicates that the signature of a software source cannot be verified because the public key for the corresponding software source is not available.
The solution is to import the public key of the software source.
We copy the public key number that appears above and try to import Ubuntu's Launchpad public key server
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9165938D90FDDD2E
After importing the public key, re-run sudo apt updateupdate package cache, and the error disappears.