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I am an Xubuntu newbie, though years ago I used Vax, then Solaris etc. I am an old analog circuit engineer, not savvy in computer systems except as a user of engineering apps. The install went well on my old Lenovo Z61m laptop, and nicely partitioned the disk so I can still use Windows XP. However, it gives no login prompt - after Grub it goes straight to the desktop with no security whatsoever. I researched to try and fix it, and found advice to change .conf file. However I get "access denied" so I can't change it. Is there a way to easily set it to provide secure startup? Thanks

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It's not a duplicate. Cheers –  user274026 Jul 8 at 12:16
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