Image download
Download the system on the Ubuntu official page ↗.
USB preparation
First, insert the USB and find what is the device’s name. Find whether the USB is sdb/sdc/etc.
sudo fdisk -l
One of these is your hard disc – be sure you found it correctly! OR YOU WILL DELETE YOUR DISC!
Fdisk will show if the usb is bootable, we can check afte rinstalation.
Se can either copy the image to the drive. Add sudo when you are SURE the sdX is the USB’s descriptor. Not sure why, but this doesn’t seem to set the bootable flag.
dd if=/path/to/image.iso of=/dev/sdX bs=4M status=progress && sync
Or use sudo usb-creator-gtk, which is seemingly safer as it shows only USB in the selection.
System installation
When copied, the USB can be inserted into the PC and run – choose to boot form that USB at boot menu. The Ubuntu then allows an installation, where one can setup whether to erase disc or to install it alongside other system.
When the system runs check the Archwiki ↗ for any notes on your computer / notebook fixes.