I decide to install Ubuntu 15.10 (64 bit) on an old laptop running Ubuntu (32 bit).
I download the ( 64 bit ) image to my hard disk and decide to decide to create a bootable USB.
I run the startup disc creator and after a while I get a message
"Can't install the boot loader". Nothing else and no suggestions as to what I should do.
I Google around and discover that I (probably?) should format my USB as FAT32 and try again.
I select the USB and Format -- no FAT32 option is available. I decide to go for EXT4 (suitable for all LINUX systems it says!!!!). The format routine fails some python routine some where can't find some oblock somewhere else.
I borrow my wife's WINDOWS computer and format the USB. No problems!
I put the USB back into my Linux computer and format(yet again) in EXT4. All seems well.
Once again I try the start up disc creator and once again I get the message "Can't create the boot loader".