We downloaded Ubuntu here http://www.ubuntu.com/download just as prompted. The 64 bit.
We followed howtoubuntu perfectly, using Rufus to put Ubuntu on a new usb stick.
We installed Ubuntu. Everything looked perfect, step by step.
The computer prompted us to restart, so we did.
With the usb stick in, we are prompted to install Ubuntu. Or one time, it started and looked like we were good to go but nothing would open. But when we try to reinstall, we are told the computer already has ubuntu, would we like to install alongside?
Without the usb stick, we are told to install an operating system. "Boot device not found"
You can probably tell by my vernacular that I am not familiar with this process. How can I fix this? Just want to run Ubuntu on the laptop.
Edit: this is an hp pavilion laptop, which I could probably tell you more about if I hadn't just deleted everything on it in a failed attempt to use Ubuntu.
Edited to add
sudo fdisk -l response:
Disk /dev/sda: 698.7 GiB, 750156374016 bytes, 1465149168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: dos Disk identifier: 0xc9478f8b Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 1457870847 1457868800 695.2G 83 Linux /dev/sda2 1457872894 1465147391 7274498 3.5G 5 Extended /dev/sda5 1457872896 1465147391 7274496 3.5G 82 Linux swap / Solaris Partition 2 does not start on physical sector boundary. Disk /dev/sdb: 57.9 GiB, 62109253632 bytes, 121307136 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x003a2730 Device Boot Start End Sectors Size Id Type /dev/sdb1 * 2048 121307135 121305088 57.9G c W95 FAT32 (LBA)