I have installed SSD in my dell laptop with HDD, i have recently installed Ubuntu 20 in my laptop , but i am seeing unknown folders from bpool to 538 MB Volume.. how can i remove these folders.. i am new to linux ecosystem..
Those are ZFS folders. Don't remove or a reinstall will be necessary.
I would suggest becoming somewhat familiar with the ZFS file system -- very interesting and easily restored back to earlier sertup -- but learn how to do it. Eliminates need for Timeshift.