$ sudo apt install php8.1-bcmath
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
php8.1-bcmath : Depends: php8.1-common (= 8.1.2-1ubuntu2.14) but 8.1.18-1+ubuntu18.04.1+deb.sury.org+1 is to be installed
E: Unable to correct problems, you have held broken packages.
我确实有 8.1.18-1+ubuntu18.04.1，但没有办法升级到 8.1.2-1ubuntu2.14。我已经运行了 apt update 和 apt Upgrade。当我尝试重新安装 php 时，我得到以下信息：
$ sudo apt reinstall php8.1
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Reinstallation of php8.1 is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.