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I am running Fedora 29

I was trying some things so I created a swap partition at /var/tmp/swap_file

then I turned on the swap file. This caused me boot errors because it filled up my root directory.

I deleted the swap file w/o removing it from fstab and now the system will not boot; it stops at systemctl error missing dependency.

How can I get the system to disable that swap file dependency so that I can boot back into my system.

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https://docs.fedoraproject.org/en-US/Fedora/23/html/System_Administrators_Guide/sec-Booting_to_Emergency_Mode.html

This article lets you know how to enter the emergency mode, which will essentially mount the system in a read only format. You will need to remount the system in rw to be able to edit your fstab and remove the invalid swap line

You can remount the filesystem by running:

mount -o remount,rw /

You should then be able to vim /etc/fstab

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