I uninstalled an app called 'Ark' months ago but the icon still remains on my menu.    I have run both ls -la /usr/share/applications/ | grep -i 'ark' and ls -la ~/.local/share/applications/ | grep -i 'ark' but nothing happens. I also tried running sudo xdg-desktop-menu forceupdate --mode system but still no luck.  When I right-click on the icon and press 'details' I get this message:    Can you please help me get rid of it?
When searching for "Skype" I always see these 2 entries.  There is this duplicate blank Skype icon. Both of them seem to run Skype in the same way.    But I've checked both /usr/share/applications, and ~/.local/share/applications, and can't find the extra icon so I can delete it.    Also as described , sometimes similar ghost icons are present even after removing associated applications.
How to know the model has started overfitting? Why is Euler's Totient function always even? I want to prove why $\phi(n)$ is even for $n&gt;3$.  So far I am attempting to split this into 2 cases.  Case 1: $n$ is a power of $2$. Hence $n=2^k$. So $\phi(n)=2^k-2^{k-1}$. Clearly that will always be even.  Case 2: $n$ is not a power of $2$. This is where I am unsure where to go. I figure I will end up using the fact that $\phi(n)$ is multiplicative, and I think I'll get a $(p-1)$ somewhere in the resulting product which will make the whole thing positive, as $p$ is prime implies $(p-1)$ is even. Easiest way to setup Ubuntu as a VPN server I have 3 folders with large amount of data in each which has to be maintained seperately. Can I create a sym link or shortcut.in windows which should show me the merged contents of the 3 folders. I am not looking for library conf in Win7.   Any suggestion is highly appreciated. How can I redefine \int to put a negative space after the integral sign, but keep the limits properly set? I'd like to modify the \int command such that it adds an automatic negative space, e.g. \! after the integral sign. Preferentially, I'd like to be able to not edit any of my code, so cleverly redefining \int seems like my best option. Unfortunately, naive implementations get the limits wrong:  \documentclass{article} \usepackage[intlimits]{amsmath} \usepackage{ifthen}  \newcommand{\diff}[2][]{   \ifthenelse { \equal {#1} {} }   {\ensuremath{\mathop{\mathrm{d} #2}}}   {\ensuremath{\mathop{\mathrm{d}^#1 #2}}} }  \begin{document}  This is what I would want: \begin{equation}  \int_0^\infty \mspace{-4mu}\diff[3]{\boldsymbol r} f(\boldsymbol r), \end{equation} but with this ``user code", containing no negative spacing explicitly: \begin{verbatim}  \int_0^\infty \diff[3]{\boldsymbol r} f(\boldsymbol r), \end{verbatim} which for comparison with the above gives: \begin{equation} \int_0^\infty \diff[3]{\boldsymbol r} f(\boldsymbol r), \end{equation}  mostly because this gives me the option to remove it or change the spacing when I see fit. \end{document}   Which results in: How can I provide anonymous user to access my REST GET API without providing any auth information? The Drupal 8 REST UI configuration page asks me to select Authentication providers for GET method; otherwise, it doesn't allow me to export the REST request.  How can I provide anonymous user to access my REST GET API without providing any auth information? Appending the same string to a list of strings in Python text-overflow: ellipsis in table-cell without width Can we have a way to access Area 51 on the iOS and android app?  More sites would flourish due to more traffic. Is there a way I can inspect my character's face at any point in the game after creating it during the bathroom scene?  I am playing on PlayStation 4 and rotating with the right stick in 3rd-person view obviously does not show the face. I haven't found any mirrors or shiny objects to use the reflection either.  The reason for this is that I forgot what she looks like and also I want to share my monstrous creation with others but I have already left the vault! I just read a description of CVE-2020-1971, which indicates that a patch was released today for openSSL, the patched version is 1.1.1i -- my version of Ubuntu 20.04.1 LTS is running openSSL version 1.1.1f.  From last March. Software Updater says that my system is up to date.  I am hoping that this openSSL update is released by Canonical by tomorrow... can anyone confirm they are working on this? How are "Suggested Tags" chosen? After you've typed in a question, you get suggested tags that appear that look like this:        It appears that you need a minimum amount of characters ():     you must have entered a title (any length) and a minimum body length of 220 characters.   But other than that, how are the tags chosen? Is it:   A match of the title/body with other questions (taking the tags from those questions) A match of the title/body with tag excerpts (taking tags with overlap) A match of the title/body with tag wikis (taking tags with overlap) All of the Above None of the Above Other (please explain)   Some additional info from :  The suggested tags seem to only pop up on meta.so (they do not work on regular Stack Overflow, or on other SE sites).  While we're on the topic, why isn't this feature implemented network-wide? How to find required information in man The man command brings up a nice manual for many programs, but how can I use it more effectively? For example man gcc brings:  NAME        gcc - GNU project C and C++ compiler  SYNOPSIS        gcc [-c|-S|-E] [-std=standard]            [-g] [-pg] [-Olevel]            [-Wwarn...] [-Wpedantic]            [-Idir...] [-Ldir...]            [-Dmacro[=defn]...] [-Umacro]            [-foption...] [-mmachine-option...]            [-o outfile] [@file] infile...         Only the most useful options are listed here; see below for the        remainder.  g++ accepts mostly the same options as gcc. .... many text   But what if I need only some part of it? What is the best way to jump to the section where -Idir is described, for example? Auto-run scripts security options How can one derive Schrödinger equation? Troubleshoot High CPU usage by the "System" process So I've got the shout in my shouts list and I've unlocked all three parts of it, but I can't seem to be able to use it all, just the first part.  Am I missing something? I still have a quest for 'Learn the first word of Durnehviir's shout' but it's showing as me having already got it.  What gives? Is there an IDictionary implementation that, on missing key, returns the default value instead of throwing? The indexer into Dictionary throws an exception if the key is missing.  Is there an implementation of IDictionary that instead will return default(T)? I know about the TryGetValue() method, but that's impossible to use with LINQ. Would this efficiently do what I need?: myDict.FirstOrDefault(a =&gt; a.Key == someKeyKalue);  I don't think it will as I think it will iterate the keys instead of using a Hash lookup. Map a network drive to be used by a service Suppose some Windows service uses code that wants mapped network drives and no UNC paths. How can I make the drive mapping available to the service's session when the service is started? Logging in as the service user and creating a persistent mapping will not establish the mapping in the context of the actual service. What is a predicate in c#?