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I tried installing Ubuntu 12.04 from DVD disk (clean install). But it gets stuck on the loading/booting screen.

On pressing Esc, I get some errors as follows:

pwconv failed to change the mode of /etc/passwd- to 0600

And in the end this is shown, after which installation just gets stuck, I can do nothing except switching off the power source:

Starting crash report submission daemon [OK]


Dell Vostro 1440
Core i3 (2nd gen)
Intel HD Graphics

Currently I have Ubuntu 10.10 (Freshly Installed from and wanted to upgrade to 12.04, but am unable to manually upgrade as authentication fails in update manager. Also, I am not able to download applications from Ubuntu software centre and it asks me to check my network/internet.

share|improve this question

Odd problem.

(You say 10.10 is installed and you're installing 12.04; are you doing a clean install, upgrading or installing onto another disk?)

The file /etc/passwd- would be a backup of /etc/passwd. The only reason for the chmod to fail I can think of is if the file doesn't exist, maybe it doesn't exist on your system, but the installer assumes it does.


$ ll /etc/passwd-

and if it doesn't exist, create it:

$ sudo cp /etc/passwd /etc/passwd-

and then try the install again, what happens now?

share|improve this answer
I was attempting a fresh install from the ubuntu 12.04 burnt on a DVD disc. The file passwd- already exists. – user156861 May 8 '13 at 18:38
Okay, I burnt a new DVD with ubuntu 11.10 and it installed without any issue. Now I'm upgrading to 12.04 using update manager, and there seems no issue now. Thanks. I think 12.04 installation wasn't working because of faulty burning maybe! – user156861 May 10 '13 at 14:44
OK, glad to hear it's working out. – Carl May 10 '13 at 18:58

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