Using the Rescue Option in RHEL 8.
First restart your server from the installation disk and select the Troubleshooting menu option.From the Troubleshooting menu, select Rescue Red Hat Enterprise Linux System. This option doesn't not overwrite your current configuration but only to load a rescue system.
The rescue system prompts user that it will try to find an installed Linux system and mount it on /mnt/sysimage. Press 1 to accept the Continue option.
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Once repair is completed, user can type exit and reboot to restart the system in a normal mode.
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