Your USB stick has files from xenial and kali on it. You need to clean
the stick before reusing it on another distro or release.
** Changed in: ubiquity (Ubuntu)
Status: Confirmed => Invalid
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubiquity (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1768200
Title: