Unknown media type in type Fix

If Linux Mint 19 (Tara) shows error during update fril 18.3.

Unknown media type in type 'all/all' Unknown media type in type 'all/allfiles'

To fix run following with sudo user:

cd /usr/share/mime
grep -R all/all *

in kde xml, remove the sections containing:
<mime-type type="all/allfiles"> <mime-type type="all/all">

sudo vi packages/kde.xml

the other files showing these sections can remain untouched.

Then run following, no errors should occur

sudo update-mime-database /usr/share/mime

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