Build Box86 (X86 linux binary emulator) on ubuntu 22.04:
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First, if on a ARM64 system, build Box64 first:

1. git clone https://github.com/ptitSeb/box64.git
2. cd box64
3. sudo apt install cmake
4. cmake .
5. make -j$(nproc)
6. sudo make install

Then build the standard Box86 for 32bit support.
1. sudo dpkg --add-architecture armhf
2. sudo apt update
3. (Optional, only if want Graphics suport) sudo apt install libgtk2.0-0:armhf libsdl2-image-2.0-0:armhf
4. cd ~
5. git clone https://github.com/ptitSeb/box86.git
6. cd box86
7. sudo apt install gcc-arm-linux-gnueabihf
8. cmake .
9. make -j$(nproc)
10. sudo make install

Sources:
https://box86.org/
https://box86.org/2022/02/box86-box64-are-easy-to-use/
https://github.com/ptitSeb/box64
https://github.com/ptitSeb/box86

Date: May 29th 2022