i have 12.04 , ubuntu, and startup diskcreator isn't allowing the program to see the iso. root perms it just doesn't load it. the usb loads fine though.
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If the .iso file was downloaded as by root for some reason it could be unreadable by your regular account. You can open a terminal with Ctrl+Alt+T and enter the commandsudo chmod a+r the-image.iso to fix that.
I assume you are using usb-creator-gtk, the standard Ubuntu tool for this. I've had some trouble selecting the iso file I want with that program because of the small window available to select files. Let me suggest starting it from a terminal by using
usb-creator-gtk -i the-image.iso
John S Gruber
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If I misunderstand what is going on, please add the command you are using and the exact error message you are getting. – John S Gruber Jun 07 '12 at 21:43
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1I tried that, but didn't work, i'm not getting any error at cmd line, and nothing in the logs. – kmassada Dec 03 '12 at 12:13
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sudo usb-creator-gtk -i the-image.iso did the trick for me... :-) – elviejo79 Apr 11 '13 at 18:51
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This was solved for me by removing any .img files from the folder where the desired Ubuntu iso is located. So basically, I had an Android boot.img inside the same folder as the Ubuntu 12.04.1 iso, which is what I wanted to use for startup-disk-creator. I moved the boot.img to a separate folder, re-opened startup-disk-creator, and it worked. I don't know if it's a quirk with specifically choosing img files over iso files; or if there is a general issue with having two or more startup-disk compatible files inside the same folder, I just know that isolating the Ubuntu iso from other types of startup files solved the issue for me.
NicholasM
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A strange error if true - it would need to be reported as a bug since it shouldn't matter if there are .img files in the same folder. – fabricator4 Dec 08 '12 at 20:14