I made room to put Linux on my net-failing WinXP system and made a wrong choice. All the drive got wiped for Ubuntu.
The Ubuntu boot USB I have is old, 10.10. It installed great but the path up without a burner is make a USB boot. I get the 32 bit iso(s) and use the boot maker but the boot(s) give an error about a config file with few details and then it tries to boot over and over with "gfxboot.c32:not a COM32R image" message.
My WAG is that my Ubuntu 10.10 isn't dealing with those isos (tried Ubuntu 14 and 16 and Linux Mint) right, they all fail the same way at least.
So I have an Ubuntu install/rescue CD otw for Monday.
One bright feature: Arduino latest stable ver copied over and installed, tested, working just fine. Serial 2000000 baud!
Seriously, 1 byte per 5 microseconds, per 80 cycles, 200000 cps. Default SPI is 500000 (clk/4 div 8 bits per byte).
I need to find an archive of my serial keyword matcher to see if it chokes at 2000000 baud! It handled 250000 baud.