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I cannot do bootable usb stick in Ubuntu 15.04 with "startup disk creator". After copying files it says: "system policy prevents installing the bootloader". This is odd because I was able to do this somehow in Ubuntu 14.04.

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It's a bug. An incredible one....

In the release notes of 15.10 beta, you can read:

Due to changes in syslinux, it is not currently possible to use usb-creator from 14.04 and earlier releases to write USB images for 15.04; we believe that it is also not possible to use usb-creator from a 15.04 system to write USB images for earlier releases. For now the workaround is to use a matching release of Ubuntu to write the images, but we intend to issue updates soon to work around this incompatibility.

See the bug here: https://bugs.launchpad.net/bugs/1325801

So it seems that, for the time being, you need 15.04 or later to build a bootable USB for 15.04 or later. Catch 22...

So to work around this issue now: create an old-fashioned DVD or try to use the mkusb method explained in https://help.ubuntu.com/community/Installation/FromUSBStick .

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  • @Fabby, lots of laptop now come without a DVD, so I think it's better to leave the link to the mkusb solution too – Rmano Oct 11 '15 at 23:54
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    True... Sorry! For an old fart like me who goes for a 17" desktop replacement laptop it's easy to forget some people like 10" no-nothing machines... Thanks for keeping the DVD sentence, though, will leave a comment next time! ;-) – Fabby Oct 12 '15 at 19:29
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    mkusb did work :-) – Jukka Oct 13 '15 at 16:42
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You need super user rights to do this. If you're using an adimn account, you'll be asked for your password. If you're a standard user / guest user, there is no way you can install a bootloader.

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