Can I convert Free  space in a LVM partition to a ext3 partition?If I run pvs:  PV         VG        Fmt  Attr PSize   PFree  /dev/sda3  ubuntu-vg lvm2 a--  297,11g 30,02gSo I have 30GB unused, I would like to take them out of the LVM partition to convert it in ext3 partition. Is it possible? Or is it better to just partition these 30 GB in a new Logical Volume?
Convert free space LVM to ext
partition;lvm
Since you have LVM set up, just use that  you can either extend an existing LV (and the filesystem it hosts), or create a new LV. See lvextend(8) and lvcreate(8) for details.