Tried recent checkra1n also. It seems to work, reboots with modified kernel cmdline, but fails to sideload anything, and leaves the device in an obscure state.

Yes, this may be overkill if your only goal is jailbreaking, but setting up a virtualized macOS environment with a working iPhone connection on Linux can be useful for anything else.

Moreover, it'll work in the future, when other solutions do not.