I used a fresh xubuntu 18.04 installation image on a wiped usb stick and
still got the same error.
** Changed in: grub-installer (Ubuntu)
Status: Invalid => New
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Your installation medium contains a mix of trusty, xenian, and kali-
rolling. You need to wipe the usb stick before reusing it to install
another distro or release.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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