I was installing Lubuntu on an external flash drive (not wise) and then when I go to boot back up on Ubuntu this pops up.

enter image description here

  • I assume that Ubuntu was installed on your main hard disk. If so, you accidentally built Lubuntu on your hard disk, not the flash drive. – heynnema May 9 at 0:04
  • I don't fully understand what you did; you tried to install Lubuntu onto a flash drive (I don't see a problem there), but your chosen grub device (grub stage 0 is the MBR of what your system boots) now points to a UUID of 6fa7d... that is no longer connected (ie. pointing to the /boot/grub/ on a disconnected device; your flash drive possibly?). If you have Ubuntu installed; you need to have it point to the always-connected hdd/sdd (and had Lubuntu's grub written to thumb-drive), but I won't give further advice as I'm guessing at what you did, clarification may help. – guiverc May 9 at 0:37
  • I hope this clarifies some things: I was trying to restore an old pc by making it boot into Lubuntu which is installed on a flash drive(#1). I said that is not wise because it is extremely slow to boot and do basic task. I had a live Lubuntu flashdrive(#2) lying around and decided to put it to use by installing it to previously mentioned flashdrive(#1). I was doing this all while my ubuntu drive is plugged in. When I took out flashdrives(#1 & 2) and tried to boot back into Ubuntu I recieved the message on the picture. Hopefully this makes sense. Do you think I installed Lubuntu over my hdd? – Magic Ex May 9 at 2:22

Like @guiverc suggests, it looks like you accidentially installed the thumbdrive's bootloader onto your harddisk.

Does your PC boot Lubuntu when you reconnect flashdrive#1 (the one you installed Lubuntu to) but set your BIOS to boot from your ubuntu-harddisk?

If yes, remove your Lubuntu-Drive again and reboot to the error message. From there you can use this guide:


to restore Grub into booting Ubuntu. It explains how to use the grub cli to find your original Ubuntu-installation, boot into it manually and reinstall grub.

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