为什么我不能在ubto中安装php mbstring？

社区下午好，为了与我的图形卡兼容，我已经从S.O从fedora改为ubuntu，我的问题是我无法安装PHPMBString包，我在控制台中遇到了这个错误

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你知道会发生什么事吗？干杯

理想情况下，在帖子中添加更多关于当前操作系统的详细信息，如uname-aide的输出；在帖子中添加更多关于当前操作系统的详细信息，如uname-a的输出

➜  ~ sudo apt install php7.4-mbstring
Reading package lists... Done
Building dependency tree       
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:
 php7.4-mbstring : Depends: libonig5 (>= 6.8.1) but it is not installable
E: Unable to correct problems, you have held broken packages.