Turn Android phone into Linux Web server

[ancient dew]

only a few phones are supported by the postmarketos project, which aims to be what you are searching for. I don't think the 9a is supported by it at all. Tho, android is linux, so the "emulator" thing is just an unprivileged chroot (proot) actually, it works quite well

If you need to access port 80/443 you might consider rooting your device

[potent moss]

that's because you have to run a linux distro on top of android using termux or similar. there's no way to install a linux distro as main on current android phones afaik, but the pinephone

or you can just use android itself to host a server