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Can I use any Linux live distribution to boot into my system and change the file for run level and set it to a valid run level when it has been set to run level 0 or 6?

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You should be able to change the run-level, as the default run-level should should either be set in /etc/inittab or a sym-link from /lib/systemd/system/<target name>.target to /etc/systemd/system/default.target. Booting from live means you ignore the installed OS entirely and use the live OS instead, but can still access the hard drive.

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