I have tried re-installing restricted extras but still cannot locate the file. Now, when I run   sudo apt-get install ubuntu-restricted-extras   I am getting this message   E: Unable to locate package ubuntu-restricted-extras   I've tried using sudo killall update-manager the response is "No process found".  I used janitor to clean my machine yesterday, Could this be the issue here as janitor might have cleaned all my packages?
When I try to install any package through the command line, I get an error.   $ sudo apt-get install &lt;package&gt; Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package &lt;package&gt;   Can anyone help me on this?
Why are p-values uniformly distributed under the null hypothesis? Is it okay to record audio for a lecture? Sometimes the Professor will say things quickly, or say things before I can write them down. It would be of great benefit if I could record audio for the course, but I am not sure the legal guidelines around doing so. Configuring Firefox to use a proxy from the command line I'm looking for a way to tell Firefox to use a proxy in Ubuntu Ludid (10.04.1 LTS).   I'm installing Ubuntu semi-automatically on several identical machines. For this, I use a script that, amongst other things, sets system-wide proxy settings:  echo "export http_proxy=http://myproxy:3128/" &gt; /etc/profile.d/proxy.sh echo "export HTTP_PROXY=http://myproxy:3128/" &gt;&gt; /etc/profile.d/proxy.sh chmod a+x /etc/profile.d/proxy.sh   I can confirm that the variables are set correctly when checking in a shell. Most programs respect this setting and use my proxy. Firefox, however, does not. When I open its network connection settings dialog, however, it is pre-set to "use system settings" for the proxy.   What does Firefox expect here? A differently-named variable? Can I set something in FF's prefs.js? How do I install HP P1102W printer driver What are the criteria for questions to be selected for Hot Network Questions? Rich Snippets not working (and working at the same time?) Database synchronization between dev/staging and production I have a problem with WordPress database synchronization between development and production and I am wondering how other people solving it. I am aware about  but it doesn't really cover the nastier and more realistic use case.  Say I have a live WordPress website. I took a dump of everything, replicating it on our dev environment. I started making changes. 1 week later I am ready to deploy my updates. In the meantime, database on production site has changed(new posts, new comments, etc.). How do I synchronize changes between production and development during the rollout and is it possible to automate(somewhat at least) this process? Is there a known mathematical equation to find the nth prime? I've solved for it making a computer program, but was wondering there was a mathematical equation that you could use to solve for the nth prime? Microsoft Office alternative for Windows? Is there something similar to Office for Windows but free? I am student living on a budget, Office is not an option at the moment. Is my proof of convergence for $\sum\limits^{\infty}_{n=1} \frac {2^n} {n^n}$ true? I want to prove that $\sum\limits^{\infty}_{n=1} \frac {2^n} {n^n}$ is convergent.  Therefore I want to use that it will be convergent if $\lim\limits_{n \to \infty}|\frac {2^{n+1}} {n^n}| &lt; 1$ is true.  But I am not sure if all of my steps are legal to do in order to do it. Here is what I came up with:  $$\lim_{n \to \infty}|\frac {2^{n+1}} {n^n}| &lt; 1$$ $$\lim_{n \to \infty}|\frac {\sqrt[n]{2^{n}} \sqrt[n]{2}} {\sqrt[n]{n^n}}| &lt; \sqrt[n]1$$ $$\lim_{n \to \infty} \frac {2 \sqrt[n]2} {n} &lt; 1$$ $$0&lt;1$$  $\Rightarrow$ It is true. Axiom of Choice: Where does my argument for proving the axiom of choice fail? Help me understand why this is an axiom, and not a theorem. etags and other tags The  tag is a synonym of , and has the description     A program to generate tags for a large project. These tags are usable by the Emacs text editor.   This is inconsistent: tags in that sense are always plural, i.e. etags, never etag.  evidently refers to another concept, .  Should  remain a synonym of , and be about HTTP Etags, and should Emacs etags be tagged +? Or should the synonym be unmade, with HTTP Etags on  and etags on ? What would you call someone who imposes on other people's generosity? What would you call someone who isn't afraid to ask for money or any kind of favor or who misinterprets someone's generosity for a consistent resource for what they need? Does any particle ever reach any singularity inside the black hole? number of prime ideals in algebraic integers What is the relation between electromagnetic wave and photon? Quantum teleportation - the alternative to destroying atoms Can't you just disassemble, not destroy our atoms and transport them to another teleporter via networking or telecoms?  This is my thinking of how to keep the same person, not an exact copy of him/her, alive when teleporting.  Please answer to tell me if it's possible or not. I am reading separable extension. I don't quite understand why $\text{char} 0$ fields must be perfect. If $F$ is a $\text{char} 0$ field, $f(x)$ is an irreducible polynomial in $F[x]$. Then why $f$ must be separable? Assume $f$ has multiple roots, say $r$ is a multiple root of $f(x)$. Then $r$ is also a root of $f'(x)$. $r$ is in the splitting field of $f(x)$ over $F$, denote it as $E$. Then why $f$ must divide $f'$? I know $f$ is irreducible but I don't know how the argument goes on. Thanks for any help! Assigning CRS to shapefile when it doesn't have one, in R? I think that by using readOGR to import a shapefile renders worthless to put proj4string to the script since if any coords are available in the shapefile, it will be transported through the readOGR.   Therefore, proj4string is expedient only if we use another import function for example readShapeSpatial (for polygons, lines or points) or by using readOGR, but in the case that the shapefile does not contain the coordinates/projection:  When checking if the shapefile has projection information and if it has not, should I add proj4string although I have put readOGR? What are advantages of bytecode over native code?