Couldn't use x86 emulators, AVD manager shows warning "/dev/kvm is not found" and telling me to edit BIOS security setting to enable VT-x.
Re-installing HAXM resolved my problem Steps:
SDK Manager -> Extras -> Intel x86 Emulator Accelerator (HAXM installer)
<sdk>/extras/intel/Hardware_Accelerated_Execution_Manager/
<sdk>
./HAXM installation -u
./HAXM installation
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