http://brainstorm.ubuntu.com/item/2298/ E: _cache->open() failed, please report."

→ This is very frequent problem and a lot of beginners dont'know why fix the problem/resolve it.
Just please look here: see - https://answers.launchpad.net/ubuntu/+faq/52 - this FAQ located/placed on Launchpad website and during 1 month there are already 15 "related questions", so that means this is very often problem.

It would be fine thing to have some automatic utility to fix this problem, but it will be enough to make this error message more user friendly (for now it's very misleading information).

[712 votes] Solution #1: Explain it better


[202 votes] Solution #2: Automatic fix


[61 votes] Solution #3: Fixit Wizard


]]> en-us Sat, 01 Mar 2008 20:31:13 +0000 Fri, 23 Oct 2009 07:58:32 +0000 QAPoll module http://brainstorm.ubuntu.com/idea/2298/ Sun, 02 Mar 2008 17:37:19 +0000 Sun, 23 Mar 2008 22:32:23 +0000 Sat, 12 Apr 2008 09:33:19 +0000 Thu, 15 May 2008 05:15:50 +0000 Instead, the package managers should stay accessible even in broken state (with a BIG warning), so the user can do something about it.]]> Thu, 15 May 2008 08:10:07 +0000
sudo dpkg --configure -a

instead of what it currently tells you to run:

dpkg --configure -a]]> Wed, 23 Jul 2008 03:32:46 +0000 Mon, 04 Aug 2008 17:00:37 +0000 Wed, 24 Sep 2008 21:54:42 +0000
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/124443

So we may see a fix at some point.]]> Thu, 25 Sep 2008 23:40:43 +0000 Sat, 20 Jun 2009 14:29:30 +0000