Open Stack Installation On Ubuntu 14.04? Can any one provide step by step installation of Open stack installation on Ubuntu 14.04?  Or   Is there any script like  for auto installation. I have tried devstack on Ubuntu but it didn't work ( Credentials Not Working ).   did work (Installation) but there is no username or password for the installation, so there is nothing to check its working or not.  Is there any way to install Openstack on Ubuntu?
How do I install OpenStack? How do I install ? Is there an easier way other than official installation instructions?
How can I keep recent files from appearing in Unity? I sometimes browse erotic media files but I would like to avoid having them appear in files &amp; folders / recent. How can I do that?  The old "making .recently-used.xbel a folder" trick from 10.10 and older doesn't work any more.   Plus I'd prefer to turn off tracking only temporarily.  I also prefer not to use a separate user for this, as switching users sometimes isn't fast enough. I'm a computer student, learning math just for fun. Today I was  that I found something strange! I noticed that that wired function ${x^{x^{\cdot^{\cdot^{x}}}}}$ in zero, seems to converge to 1 when there are even powers and to 0 when there are odd powers! Then I attempt to prove it but I failed.  Then I did a little research and I found the  article on Wikipedia. This article says that my guess was right but without any proof. So I'm here to ask you about it.     If we define ${x^{x^{\cdot^{\cdot^{x}}}}}$ as ${^{n}x} :=\begin{cases} 1 &amp;\text{if }n=0 \\ x^{\left(^{(n-1)}x\right)} &amp;\text{if }n&gt;0 \end{cases}$      then prove:      $$\lim_{x\rightarrow0} {}^{n}x = \begin{cases}   1, &amp; n \text{ even} \\  0, &amp; n \text{ odd} \end{cases}$$ How do I execute a string containing Python code in Python? How to start a background process in Python? If the edges of the complete graph $K_{17}$ (on 17 vertices with no three collinear) are each colored one of three colours can it be proven to have two or more monochromatic triangles? How to setup login time limits (a.k.a. "parental controls") if you don't want to login with a Microsoft account? When creating accounts on Windows 10, you get a choice between "Your family" and "Other users".  If you choose "Your family" you are forced to use a Microsoft account to sign in. There are various reasons why one wouldn't want to do that, such as too much sharing of private information with Microsoft, etc.  If you choose "Other users" you can create regular accounts just fine. However, if you need to setup time limits for some accounts, it is impossible to do so. It is a feature exclusive to "Your family". Not all time-restricted users I want to create are my family, and not everyone is okay with sharing their info with Microsoft.  So, is there a way to setup login time limits for the "Other users" type of accounts? Reputation widget failure on Android The title says it all. When I try to place the reputation widget on my home screen, I get this:  When I try again, I get this error, presumably because the Stack Exchange service has stopped.  Is this a bug? If so, where should I report it?  I am running Android 5.1 armeabi on a DigiLand DL718M tablet. When Bottom Navigation Isn't Best I'm developing a mobile app and dealing with various UI/UX issues. I'm open to all kinds of ideas at this stage, however some designers I consult with seem to be zealots for bottom-navigation and are hesitant in actually analyzing whether the bottom-nav is actually best for my app; they just want me to use the bottom tabs navigation as if it's some UI law.  One point I try to bring up is that my business model has users who aren't typical one-handed mobile users, are tech savvy, would use my app more of a tool, and would spend only a few minutes in it. The app isn't a typical lazy-content-browsing experience where you want to minimize fingers-over-top-of-screen interference, and where you want to keep the use transfixed and spending time in the app.  Anyways, I'd like to hear about situations where a bottom nav was decided-on, or started-with, and you had good reason to eliminate it and go with another navigation design.  Most articles out there talk about eliminating hamburger menus and diving into bottom nav. Is the converse simply going back to hamburger menu? In history we are taught that the Catholic Church was wrong, because the Sun does not move around the Earth, instead the Earth moves around the Sun.  But then in physics we learn that movement is relative, and it depends on the reference point that we choose.  Wouldn't the Sun (and the whole universe) move around the Earth if I place my reference point on Earth?  Was movement considered absolute in physics back then? How do I enable auto-login in LightDM? I want user foo to auto-login using LightDM (which has been used by Ubuntu since version 11.10). How would I do that? I have a string which is like this:  this is "a test"   I'm trying to write something in Python to split it up by space while ignoring spaces within quotes. The result I'm looking for is:  ['this','is','a test']   PS. I know you are going to ask "what happens if there are quotes within the quotes, well, in my application, that will never happen. Change MySQL default character set to UTF-8 in my.cnf? Windows 7 booting fail with error code 0xc0000225 I have an HP laptop Pavilion DV4. Last night, I installed Ubuntu and there was an problem about partitioning the hard disk, and I think I deleted the Windows boot record.  I didn't burn a recovery disc but there is built-in recovery partition on the hard disk.  All I want to do is to perform a Factory Restore but I need recovery disc. I could burn that disc from the recovery partition using HP recovery manager, but can't burn now. I can't also boot HP recovery manager using F11 key, because it has the same boot error.  I want to boot Windows 7 and want to burn recovery disc. How can I boot into my old windows 7. If I can boot it, I can burn Recovery Disc and I will make Factory Restore if it's needed.  I didn't make any changes to windows 7 partition but I did a problem about Boot Record.  There is a system partition on hard disk with the size of about 200 MB.There is BOOT folder too.  Installation of Ubuntu also failed, so I'm booting from Live Ubuntu USB. What does $\rightarrow$ mean in $p \rightarrow q$ I was looking at an exercise where it asked the following:  $$\begin{array}{ccc} p&amp;q&amp;p\rightarrow q \\ T&amp;T&amp;T \\ &amp;\ldots \end{array}$$  So, for the third column, I just put $T$ which was correct but I didn't understand what $\rightarrow$ meant. I have seen $\implies$ but I haven't the arrow. Are they the same thing?  Thanks a bunch! How did the ending happen from Neil's perspective? I am trying to figure out the scene near the finale of Tenet where Neil unlocks the door and gets shot in the face. I can't really see the flow where he opens and holds the door and the protagonist walks in and fights the bad guy. Can you tell the series of events as Neil sees them happen till he gets shot? UPDATE If I am not wrong, I see it like this: Neil was running down towards the door, both the protagonist and his mate are inside with the door locked fighting the bad guy, then, he unlocks the door and walks in and stands behind the door. The protagonist's mate comes out of the room, then the protagonist, then he closes the room, then he look back to get shot in the face. But this doesn't make sense, if he wanted to unlock the door when he was running down, they were already in fighting the bad guy!!!!! The following problem came up from a though I had while reading:  Let's say we have $M=\mathbb{Z}^n$ and we have another free $\mathbb{Z}$-module, $N$, inside of $M$ also with rank $n$.  We know we can make a matrix $A$ that changes $N$ to its representation in $M$ (ie has as columns the basis $N$ expressed in coordinates coming from the basis of $M$). If the index of $N$ in $M$ is $m$, I am pretty sure just from tinkering that the determinant of $A$ should also be $m$, however, I have not been able to show this.  It is unclear to me how to proceed. I though maybe I could do something related to the points in $\mathbb{Z}^n$ that are within the unit box of $N$, but I cannot really make sense of this.  Thank you for any help or direction. Difference of Gamma random variables Show $a\Bbb Z+b\Bbb Z = \gcd(a,b)\Bbb Z$ Disallow closing of questions with a certain number of question / answer upvotes With reference to this currently open question   At the time of writing, it has 3 close votes yet has 7 question upvotes and the single answerer (11 upvotes) will have been awarded the enlightened badge (silver).  Therefore in the opinion of many (i) the question adds value and (ii) the answer adds value.  As a staring point for discussion, I suggest that 5 net question upvotes (and perhaps 5 answer net upvotes) should be enough to keep a question permanently open. Let's haggle over the numbers though. Thoughts? Solving factorial equations I am given that $${n \choose a}={n \choose b}$$ I need to show that $n=a+b$ or $a=b$.  Now I am left with $a!(n-a)!=b!(n-b)!$.  I don't know what to do next. I checked there on google to solve the above, it says:- "On comparing, we get the required result." But it makes no sense to me.