After installing Debian Testing "Bullseye" mid March 2020 I got an
error trying to run apt update.
2020年3月中旬安装Debian Testing "Bullseye"后,尝试运行 apt update 时出现错误。

E: The repository ' 
bullseye/updates Release' does not have a Release file.

Unfortunately, the Debian maintainers managed to let a bug creep into
the /etc/apt/sources.list. It’s called "Testing" for a reason, I
很不幸,Debian的维护者们在 /etc/apt/sources.list 中引入了一个bug。我猜这就是为什么它被称为“测试版”。

The offending lines are this.

deb bullseye/updates main
deb-src bullseye/updates main

Note "bullseye/updates", which is where the error is. Change those
two lines to look like this.

deb bullseye-security main
deb-src bullseye-security main

After that, the update will work. I have noticed that in a later
version of the installer this bug has been fixed.

作者 灰武士