[Q] G2 stuck in an installation loop that started while updating to KitKat - G2 Q&A, Help & Troubleshooting

I am stuck in an installation loop that started while updating to KitKat.
I was happy with my LG G2 (T-mobile, D801G), but wanted to use root apps. So, I rooted and installed TWRP, but did not flash a custom rom.
Tuesday when I woke up there was a message saying I could download KitKat. After installing my last system update I lost root, so just had to unroot and re-root – took me about 15 minutes. So, I decided to go ahead and install KitKat.
It downloaded and began to install, but got stuck in a loop. The LG logo flashes for 5 seconds, the little droid pops up with his stomach spinning and the message “Installing system updates” but shows for only about ½-second. Then the screen goes black for 2 seconds and it starts again.
I can get it into the factory reset screen, but when I say yes-yes, it puts up the message :
Error: Boot certification verify
341120
341170
341220 Secure booting error!
341270 Cause: boot certification verify
341320
341370
(the nunbers are different each time, but always 6 numbers in increments of 50)
Then it sits in a black, but not quite off screen until I hold down the power button to turn it off. When I turn it back on, it shows the logo, then the droid showing the message ‘Erasing…’ for a full second, then switches to the ½-second ‘installing system updates’ loop.
It will go into download mode. When I connect it to the LG flash tool ‘Up Test’ it says all firmware is up-to-date.
I tried this: http://forum.xda-developers.com/showthread.php?t=2582142 but I couldn’t get Ubuntu 12.04 to install gdisk. Then I noticed that
ls /dev/sd*
returned the same values whether my phone was plugged in in download mode or unplugged completely. The values were
/dev/sda, /dev/sda1, /dev/sda2, /dev/sda3, /dev/sda4.
I tried the next step anyway
gdisk -l /dev/sdb
and got the error saying gdisk was not found, but I could install it with… etc. I tried to install it, but it wouldn’t work.
This is the second phone I’ve rooted – I had my HTC Sensation rooted for years, and flashed many ROMs. I hadn’t played much with the G2 because I liked it just the way it was – but had to have some rooted apps. I also have an HP Touchpad running Cyanogenmod. My experience with Linux is limited. So I’m just one step up from a noob.
Any advice would be appreciated! I bought a go phone so that I can take my time and fix my G2 right. :-/

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