How do I install TeamSpeak? I have successfully downloaded the Linux version but cannot get it to execute. It appears to come up with misread character type or error.  So, how do I install TeamSpeak successfully on Ubuntu
Installing Teamspeak and creating TeamSpeak3 .desktop file I am very new to Ubuntu and I want to create desktop launcher.  I have this in my TeamSpeak3.desktop in   [Desktop Entry] Name=TeamSpeak 3 Comment=TeamSpeak 3 VoIP Communicator Exec=/opt/TeamSpeak3-Client-linux_amd64/ts3client_runscript.sh Terminal=false Type=Application Categories=Network;Application; Icon=/opt/TeamSpeak3-Client-linux_amd64/styles/default/logo-128x128.png   in my ~/.local/share/applications/TeamSpeak3.desktop But I dont see it in my launcher and when I double click on it files, it just opens the text file. I even made it executable with     chmod +x TeamSpeak3.desktop  drwx------ 15 hung hung     4096 srp 16 12:29 . drwxr-xr-x  3 root root     4096 pro  9 19:22 .. -rw-------  1 hung hung   174627 srp 16 12:29 CHANGELOG -rwx------  1 hung hung   227136 srp 16 12:29 error_report drwx------  2 hung hung     4096 srp 16 12:29 gfx drwx------  3 hung hung     4096 srp 16 12:29 html drwx------  2 hung hung     4096 srp 16 12:29 iconengines drwx------  2 hung hung     4096 srp 16 12:29 imageformats -rwx------  1 hung hung   334520 srp 16 12:29 libc++abi.so.1 -rwx------  1 hung hung  1934744 srp 16 12:29 libcrypto.so.1.0.0 -rwx------  1 hung hung   746960 srp 16 12:29 libc++.so.1 -rwx------  1 hung hung  5842312 srp 16 12:29 libQt5Core.so.5 -rwx------  1 hung hung   484832 srp 16 12:29 libQt5DBus.so.5 -rwx------  1 hung hung  5683224 srp 16 12:29 libQt5Gui.so.5 -rwx------  1 hung hung  1335584 srp 16 12:29 libQt5Network.so.5 -rwx------  1 hung hung   290008 srp 16 12:29 libQt5Positioning.so.5 -rwx------  1 hung hung  3829280 srp 16 12:29 libQt5Qml.so.5 -rwx------  1 hung hung  3831288 srp 16 12:29 libQt5Quick.so.5 -rwx------  1 hung hung   234552 srp 16 12:29 libQt5Sql.so.5 -rwx------  1 hung hung   331232 srp 16 12:29 libQt5Svg.so.5 -rwx------  1 hung hung   117104 srp 16 12:29 libQt5WebChannel.so.5 -rwx------  1 hung hung 67570152 srp 16 12:29 libQt5WebEngineCore.so.5 -rwx------  1 hung hung   208344 srp 16 12:29 libQt5WebEngineWidgets.so.5 -rwx------  1 hung hung  6439120 srp 16 12:29 libQt5Widgets.so.5 -rwx------  1 hung hung  1334528 srp 16 12:29 libQt5XcbQpa.so.5 -rwx------  1 hung hung   180248 srp 16 12:29 libquazip.so -rwx------  1 hung hung    22936 srp 16 12:29 libsnappy.so.1 -rwx------  1 hung hung   111888 srp 16 12:29 libsrtp.so.0 -rwx------  1 hung hung   383072 srp 16 12:29 libssl.so.1.0.0 -rwx------  1 hung hung    51080 srp 16 12:29 libudev.so.0 -rw-------  1 hung hung     4340 srp 16 12:29 openglblacklist.json -rwx------  1 hung hung   260232 srp 16 12:29 package_inst drwx------  2 hung hung     4096 srp 16 12:29 platforms -rw-------  1 hung hung       26 srp 16 12:29 qt.conf drwx------  2 hung hung     4096 srp 16 12:29 qtwebengine_locales -rwx------  1 hung hung    19720 srp 16 12:29 QtWebEngineProcess drwx------  2 hung hung     4096 srp 16 12:29 resources drwx------  6 hung hung     4096 srp 16 12:29 sound drwx------  2 hung hung     4096 srp 16 12:29 soundbackends drwx------  2 hung hung     4096 srp 16 12:29 sqldrivers drwx------  3 hung hung     4096 srp 16 12:29 styles drwx------  2 hung hung     4096 srp 16 12:29 translations -rwx------  1 hung hung 18987008 srp 16 12:29 ts3client_linux_amd64 -rwx------  1 hung hung     1364 srp 16 12:29 ts3client_runscript.sh -rwx------  1 hung hung  2206064 srp 16 12:29 update drwx------  2 hung hung     4096 srp 16 12:29 xcbglintegrations
This is a general question that was asked indirectly multiple times in here, but it lacks a single authoritative answer. It would be great to have a detailed answer to this for the reference.  , the proportion of correct classifications among all classifications, is very simple and very "intuitive" measure, yet it may be a . Why does our intuition misguide us here and are there any other problems with this measure? Leagues still count association bonus Any way to control light halos in the compositor based on emission level? I am wanting to animate a row of LED lights. I have separated the LED lights from the rest of my object with the pass index/ID mask functions; currently all of my LED lights are on pass index #1.  What I want is to have a minor halo effect around the lights, but only when they are active. Currently, when I add a halo effect to my pass index #1, all of the LED lights have a halo effect regardless if the LEDs are emitting light. All LEDs are diffuse and emission shaders, so I can animate by controlling the mix amount between diffuse and emission.   Is there any simple way to have the halo effect created through recognizing light emission values, or will I have to just animate each LED as its own layer of compositing? More homework help.  Given the function $f:A \to B$.  Let $C$ be a subset of $A$ and let $D$ be a subset of $B$.  Prove that:  $C$ is a subset of $f^{-1}[f(C)]$  So I have to show that every element of $C$ is in the set $f^{-1}[f(C)]$  I know that $f(C)$ is the image of $C$ in $B$ and that $f^{-1}[f(C)]$ is the pre-image of $f(C)$ into $A$.  Where I'm stuck is how to use all of this information to show/prove that $C$ is indeed a subset.    Do I start with an arbitrary element (hey, let's call it $x$) of $C$? and then show that $f^{-1}[f(x)]$ is $x$?  I could use a little direction here...  Thanks. When to use a preceding slash in path names? (e.g. for the 'cd' command) I am a novice user and I am trying to install Oracle Java. The process calls for me to access /usr/local/java, but here is the problem. I get as far as /usr/local, then this is the message I get:  leonard@leonard-MT6452:/usr/local$ dir bin  etc  games  include  java  lib  man  sbin  share  src  leonard@leonard-MT6452:/usr/local$ cd /java/ bash: cd: /java/: No such file or directory  leonard@leonard-MT6452:/usr/local$ rm -r ~/java rm: cannot remove ‘/home/leonard/java’: No such file or directory   Help? Windows 7 msconfig lets users select the options No GUI boot and OS boot information to have a list of drivers being loaded during boot. Is it possible to have similar detailed messages during shutting down/restarting/logging off? Here's the screen I want disable or give me more details: Adobe Illustrator: Lines with stroke < 2.0pt doesn't change color I created lines using the line segment tool in Adobe Illustrator (latest Adobe Cloud version) and I can't change the color of the stroke (through the Appearance panel) if the stroke weight is less than 2.0pt.   If the stroke is 2pt or more, then the color around the line changes but not the line itself.    The whole behavior is odd for me as I've never faced in Illustrator before.  Edit: added screen below with the line selected. Is there a way to disable file:/// protocol in google chrome?  Is there some option, or some switches that can disable this feature?  Please help Converting mobi files to pdf files I have a Hanlin V3+ e-book, unfortunately it crashes too often when reading mobi files, so I want to convert them first into pdf, and then read pdf on V3+. Is there any tool for converting mobi files to pdf files? Thanks. This is problem 31b) from Dummit and Foote chapter 14.2. I am looking for a hint on how to attack the problem, since I have been thinking about it for a couple of hours but I don't even know where to start. The problem says:  Let $K$ be a finite extension of $F$ of degree $n$. Let $\alpha$ be an element of $K$. Prove that the minimal polynomial for $\alpha$ over $F$ is the same as the minimal polynomial for the linear transformation $T_{\alpha}$. In this problem, $T_{\alpha}$ is an $F$-linear transformation of $K$ that arises from $\alpha$ acting by left multiplication on $K$.  I appreciate any helpful suggestions on how to start attacking the problem or any possible hint. Thanks! How to get back to a site when viewing one of its questions When viewing a question on a site which I don't use (I never registered on it), I can't figure out how to get back to the list of questions of the site.  See this example  from the Stack Exchange Android app. Where should I click to see the list of questions? (I chose Mathematics Educators because it's the most recent site, it is very likely that most users don't have an account on this website)  Here is a random example:    When viewing a question, I don't know how to view the list of questions. This site can't be found in the sidebar since it's not in my Your Sites list. The top menu containing the site's title only opens the sidebar. magit: how to diff the same file between two different commits on the same branch? How do you validate that two math expressions are equal? Let's say you have a few expressions like the following:  $$\begin{array}((x+17)^2 \\ x^2 + 34x + 289 \end{array} \\ 288 + \frac{x^2}{2} + \frac{x^2}{2} + 34x + 1 \\ [...] $$  You get the idea: there's an infinite number of ways of representing the same expression. The challenge is that my application is validating answers to math problems, input by math students practicing a certain concept. I'd like to make sure that whenever they submit an answer, the checker is completely insensitive to the issues of ordering, simplification, formatting etc. which would be plain frustrating. I'd also ideally like to support more than one variable such as x, y, z in the same expression.  What's a reliable way to check that two expressions are the same? The most brute force way I can think of would be to just plug a number into each variable of each expression and see what the result is.  I have a hunch however that there might be ways of getting false positives this way. That, and I might be either missing something really obvious about this, or there might be a better way of doing the comparison.  Would love to hear what you think. We know Euler formula:  $$ e^{ix}=\cos(x)+i\sin(x). $$  Does this formula work if we replace real number $x$ with complex number $z$? Let $a_1=1$ and $a_n=n(a_{n-1}+1)$ for $n=2,3,\dots$. Define $$P_n=\left(1+\frac{1}{a_1}\right)\left(1+\frac{1}{a_2}\right)\dots\left(1+\frac{1}{a_n}\right)$$Find $$\lim_{n \to \infty}P_n$$   Trial: $$1+\frac{1}{a_n}=1+\frac{1}{n(a_{n-1}+1)}\;.$$ But I can't simplyfy.Please help. Generating list of manually installed packages and querying individual packages I'd like to get a list of packages installed manually by apt or aptitude and be able to find out whether a foobar package was installed manually or automatically. Is there any neat way of doing that from the command line? $N$-body simulation in General Relativity How would one perform an $N$-body simulation in General Relativity (GR) for something like galaxy formation or galactic dynamics?  Suppose one wants to simulate the rotation curve $v(r)$ for galaxies with an $N$-body simulation, and wants to do it in the framework of GR / the Einstein equations. Finding places to play Magic the Gathering games A friend of mine recently got MTG for the XBox and is talking us into getting real cards.  I'm all up for starting but I dread the idea of playing the same two people over and over with no change epically since one of them is over competitive and exploits every loophole he can to win.  Does anyone know of any a reliable (not just google it) way to find places where people play MTG? Multivariable Delta Epsilon Proof $\lim_{(x,y)\to(0,0)}\frac{x^3y^2}{x^4+y^4}$ --- looking for a hint I have the limit $$\lim_{(x,y)\to(0,0)}\frac{x^3y^2}{x^4+y^4},$$ and would like to show with an $\epsilon-\delta$ proof that it is zero. I know with a situation like $$\left|\frac{x^4y}{x^4+y^4}\right|\leq y$$  or something similar, but I can't find a way to do the same thing here, as no single term in the numerator is of sufficient degree, although I think I could get this with a small hint. How can I get apt to use a mirror close to me, or choose a faster mirror? Downloading from the main Ubuntu archive is slow even when it's not release day, how can I get apt-get to automatically use a mirror that is close to me?