I believe most of the Fedora systems use LVM with a separate /boot as the default install. You can add lvm2 driver in Ubuntu to get it to work with LVM. The main advantage of LVM is that you can easily change partitions around, but if multi-booting often better to just use ext4 for any Fedora type installs. Also standard partition tools do not work with LVM, so you have to use LVM partition tools to modify LVM partitions.
So if you have no data you want to save in your LVM install you can just delete those partitions.
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