(debian-policy.info)Essential

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5.6.9 ‘Essential’
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This is a boolean field which may occur only in the control file of a
binary package or in a per-package fields paragraph of a source package
control file.

If set to ‘yes’ then the package management system will refuse to remove
the package (upgrading and replacing it is still possible).  The other
possible value is ‘no’, which is the same as not having the field at
all.