一般来说，Unity编辑器的安装，官方已经给出了安装教程。

但是这个忽略了RHEL 9的一个特性：默认的加解密策略已经不支持SHA1了，你会在执行yum install unityhub那里出现如下报错：

[shepherd@localhost ~]$ sudo yum install unityhub
\Last metadata expiration check: 0:00:05 ago on Mon 01 Jul 2024 12:39:57 AM CST.
Dependencies resolved.
================================================================================
 Package              Architecture  Version              Repository        Size
================================================================================
Installing:
 unityhub             x86_64        3.8.0-1              unityhub         110 M
Installing dependencies:
 libXScrnSaver        x86_64        1.2.3-10.el9         appstream         25 k

Transaction Summary
================================================================================
Install  2 Packages

Total download size: 110 M
Installed size: 434 M
Is this ok [y/N]: y
Is this ok [y/N]: y
Downloading Packages:
(1/2): libXScrnSaver-1.2.3-10.el9.x86_64.rpm     42 kB/s |  25 kB     00:00    
(2/2): unityhub-x86_64-3.8.0.rpm                8.4 MB/s | 110 MB     00:13    
--------------------------------------------------------------------------------
Total                                           7.8 MB/s | 110 MB     00:14     
Unity Hub                                       3.2 kB/s | 3.1 kB     00:00    
Importing GPG key 0x34E8243F:
 Userid     : "Unity Technologies ApS <security@unity3d.com>"
 Fingerprint: A08C A7CD 4D00 6A41 28EC 2850 BE3E 6EA5 34E8 243F
 From       : https://hub.unity3d.com/linux/repos/rpm/stable/repodata/repomd.xml.key
Is this ok [y/N]: y
Key imported successfully
warning: Signature not supported. Hash algorithm SHA1 not available.
warning: Signature not supported. Hash algorithm SHA1 not available.
Import of key(s) didn't help, wrong key(s)?
Problem opening package unityhub-x86_64-3.8.0.rpm. Failing package is: unityhub-3.8.0-1.x86_64
 GPG Keys are configured as: https://hub.unity3d.com/linux/repos/rpm/stable/repodata/repomd.xml.key
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: GPG check FAILED

解决方法很简单，将默认的crypto策略改称SHA1即可。 

[shepherd@localhost ~]$ sudo update-crypto-policies --set DEFAULT:SHA1
Setting system policy to DEFAULT:SHA1
Note: System-wide crypto policies are applied on application start-up.
It is recommended to restart the system for the change of policies
to fully take place.

然后重试命令。