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What's happened: I have modified the fstab file. My aim was to mount an external hard disk permanently. I duly changed the username, but forgot to change the "sdb4" to sdb1" in the command line and pasted it to a terminal window. Now Ubuntu does not boot, I am on a choo-choo train or loop, and I have forgotten the root password. This afternoon I created a boot repair usb stick, but this does not work either. F6 key does not work and I cannot choose the "no mode set". I fear I might well have to delete the Ubuntu partition (I am on dual boot: windows 7 /Ubuntu 18.4) and try a fresh install, thus losing some data....

  • You can try booting from a Live CD/USB and seeing if you can mount your drive to rescue your files. Not sure if you'll need your root password or not, but there should be plenty of instructions online on how to do this. – guttermonk Aug 17 at 2:16

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