I'm recent user of Ubuntu (Linux). How can we make Applications (Ubuntu Software) to access all the DRIVES in my computer.  For example, I just downloaded « Krita ». When I simply try to open a file saved on my computer ...or... on my USB drive using File > Open then the ensuing window Look In: , NOT ALL locations are accessible, just the /home/andre/snap  ??? and some other folders.  Even my INTERNAL SANSUNG SSD drive is NOT accessible. Thanks.    I'm running Ubuntu 18.04.3 LTS.
This question is NOT about access to USB or external drives.  WPS Witer and other just installed Ubuntu software can NOT open files saved on my /media directory. I keep getting the annoying message: « Could not read the contents of '/media': Permission denied ».   MY SIMPLE QUESTION REMAINS:  How can I access all files and folders on my user username/media/ directory?  I'm using Ubuntu 18.04.3 LTS.  Ubuntu's Nautilus can indeed access all files and folders in all locations. However, Ubuntu's software that I have downloaded (e.g. KRITA, WPS WRITER etc) can NOT access any file or folder on the /media directory. Thanks in advance.
Show that $\{\cos\ n:n \in \mathbb{N}\}$ is dense in $[-1,1]$ by using the fact below:      Suppose $x$ is irrational. Then there exists $p_n,q_n \in \mathbb{Z}$   such that $\bigg|x -\frac{p_n}{q_n}\bigg| &lt; \frac{1}{q_n^2}$   I have no idea on how to apply the fact above to show the set is dense in $[-1,1]$. Can anyone help me? How do I stop Windows 10 from updating my graphics driver? Every time Windows 10 runs updates (which I see no way to control), it updates my graphics driver.  I like the old one because it is faster.  So, I have to reinstall it.  This is getting to be a pain.  Is there any way to stop Windows 10 from updating it again? jQuery Validate Plugin - How to create a simple custom rule? How do you create a simple, custom rule using the jQuery Validate plugin (using ) that doesn't use a regex?  For example, what function would create a rule that validates only if at least one of a group of checkboxes is checked? Windows 10 64-bit requirements: Does my CPU support CMPXCHG16b, PrefetchW and LAHF/SAHF? I'm currently trying to find out whether or not it would be a good idea to update my slightly dated notebook (Windows 7, 64-bit) to Windows 10. The problem is that Microsoft states in their  that to use the 64-bit version of Windows 10, a processor which supports CMPXCHG16b, PrefetchW and LAHF/SAHF is needed. I know that my processor is 64-bit (Intel Core i5-2430M @ 2.40 GHz) but I don't know how to find out whether it supports CMPXCHG16b, PrefetchW and LAHF/SAHF, and I have no idea what these mean.  I tried using Google and got no results that made sense to me, only some comparison of my i5 and a similar AMD processor. I also checked Intel's ARK website. If somebody could point me to where I can get more info I would be really grateful. I'm including \usepackage{hyperref} so that each instance of \ref (as well as each page number in the index and the table of contents) automatically links to that page.  When I'm viewing the document (in ) and I click a link, I jump to the linked page.  Is there any easy way to go "back" to where I was before I clicked the link?  (And is the answer any different when using Adobe Acrobat reader?) CSS3's border-radius property and border-collapse:collapse don't mix. How can I use border-radius to create a collapsed table with rounded corners? Find and replace text within a file using commands Where can I find the application executables in the filesystem? Prove $5\mid2^{4n}-1$ by induction How do I root my Android device? This is a common question asked by those who want to root their phones. How exactly do I root my Android device? Are there risks involved? Every subspace of a vector space has a complement I want to see if my proof is true or I thought very trivially?    If $H$ is a subspace of a finite dimensional vector space $V$, show there is a subspace $K$ such that $H\cap K=0$ and $H+K=V$    So far I have tried :    $H\subseteq V$ is a subspace $\Rightarrow\,\exists\;K=(V-H)\subseteq V$ $K$ is a subspace because it's the sum of two subspace $V$ and $(-H)$ Now we should prove that $H\cap K=0$ We assume $H\cap K\neq0\Rightarrow\exists\,\vec u\neq0\,,\,\vec u\in H\cap K$ $\vec u\in H\cap K\Rightarrow \begin{cases}\vec u\in H\\\vec u\in K\,\Rightarrow\vec u\in V-H\Rightarrow\vec u\in V,\,\vec u\notin H\end{cases}$ That's a contradiction so our hypothesis was wrong and $\vec u=0$ How to use variable inside parameter $_GET? example: ($_GET[$my_var]) What's the best blog post/video/tweet/whatever to explain how the Stack Exchange system works to regular people? I am trying to gauge interest for a new Stack Exchange site, but I want to explain it to people as best (and preferably) as visually as I can. Any YouTube clips breaking it down?  anyone?  Note: I am fully aware of , but mine is about Stack Exchange, not Stack Overflow.  Most people think I'm describing traditional forum software, which they know sucks. Is there some way to describe the magic of how the design of the Stack Exchange system actually produces useful results very quickly? I can describe generally that it is a Q&amp;A site that users vote on the answers, but Stack Overflow feels like so much more. Am I perhaps thinking too big about this? I have a Canon XTI which I've been using for a few years now. Most of the time I'm been shooting in one of the "semi-manual" modes like aperture priority or shutter priority, but now I'd like to try using full manual mode. I should have a new EF-S 17-55 f/2.8 delivered when I get home today. Before I was using a variable aperture Sigma 17-70 which made manual mode more difficult with the aperture changing arbitrarily.  I understand the effect of changing aperture and shutter speed, but right now I'm accustomed  to only controlling one at a time. The camera is usually setting the other to get the right exposure automatically for me. So if I'm controlling both how do I know I have the correct exposure? I understand I need to use the metering in my camera but I'm not sure exactly how do do that.   First when should I be using each of the metering modes (Evaluative, Partial, Center weighted, or Spot)? These just change the area of the scene which is metered correct?  How do I know what the meter should read off a specific object? Obviously if I just happen to be shooting a 18% gray wall then it should be at zero, but that can't apply to everything? If I'm shooting a black cat and take a spot meter reading off of the cat then the meter should read less then zero right? But how do I know how much less then zero? Are there rules of thumb I can follow? I've ordered a couple gray cards with my new lens. So experimenting with those should help.  How often should I be changing these settings? Say I'm at a party indoors which is consistently lit. I should be able to set the aperture, shutter speed, and ISO and just forget about it unless the lighting changes correct? Does the same apply to outdoor scenes? I've been hesitant to use manual mode in the past because I felt like I was spending a lot of times messing with settings before each shot. But not I'm realizing that this is really only the case when the lighting changes, or I want a different style of photo such as a different depth of field.  Finally, does exposure change with distance to the subject? For example say I want to take a picture of a statue with correct exposure using a gray card. I'd place the card on the statue, and while being careful not the block the light on the card find the correct exposure by spot metering the card. If I were then to step back 20' to get the whole statue in frame would I still have the correct exposure? How to uncover a table column wise in Latex beamer I have a table with 7 columns and want to show the first 5 at once, and then  the 6th and 7th on consecutive slides.  This is the code I have for now:  \begin{frame}{Наслов}     \begin{itemize}         \item Ставка.     \end{itemize}         \begin{tabular}{ccccc&lt;{\onslide&lt;2-&gt;}c&lt;{\onslide}c}             $p_1$ &amp; $p_2$ &amp; $\ldots$ &amp; $p_{9}$ &amp; $p_{10}$ &amp; $W$  &amp; $D$\\             $1$   &amp; $1$   &amp; $\ldots$ &amp; $1$      &amp; $1$     &amp; $w_1$&amp; $d_1$\\             $1$   &amp; $1$   &amp; $\ldots$ &amp; $1$      &amp; $0$     &amp; $w_2$&amp; $d_2$\\             $1$   &amp; $1$   &amp; $\ldots$ &amp; $0$      &amp; $1$     &amp; $w_3$&amp; $d_3$\\             $1$   &amp; $1$   &amp; $\ldots$ &amp; $0$      &amp; $0$     &amp; $w_4$&amp; $d_4$\\             $\vdots$ &amp; $\vdots$ &amp; $\vdots$ &amp; $\vdots$ &amp; $\vdots$ &amp; $\vdots$ &amp; $\vdots$\\             $0$   &amp; $0$   &amp; $\ldots$ &amp; $0$      &amp; $1$     &amp; $w_{1023}$&amp; $d_{1023}$\\             $1$   &amp; $1$   &amp; $\ldots$ &amp; $0$      &amp; $0$     &amp; $w_{1024}$&amp; $d_{1024}$         \end{tabular} \end{frame}   This produces 2 slides: the first one with p1, p2, ..., p9, p10 and D columns, and the second with W added, while I want them to appear in the following order:   1st slide: p1, p2, ..., p9, p10  2nd slide: p1, p2, ..., p9, p10, W 3rd slide: p1, p2, ..., p9, p10, W, D   I looked in the manual and found this example:  \begin{frame}     \begin{tabular}{l!{\vrule}c&lt;{\onslide&lt;2-&gt;}c&lt;{\onslide&lt;3-&gt;}c&lt;{\onslide&lt;4-&gt;}c&lt;{\onslide}c}     Class &amp; A &amp; B &amp; C &amp; D \\     217     X &amp; 1 &amp; 2 &amp; 3 &amp; 4 \\     Y &amp; 3 &amp; 4 &amp; 5 &amp; 6 \\     Z &amp; 5 &amp; 6 &amp; 7 &amp; 8     \end{tabular} \end{frame}   which does what is supposed to. However, I don't seem to be able to apply its logic to my problem. :( Is anyone willing to help?   P.S. What are the meanings of &lt; and ! in columns specification? How to draw neat polygons around scatterplot regions in ggplot2 What is this Windows 8 icon for as rectangle icon in the title bar? Differences in the behaviour of pinching a garden hose and closing a tap Let's say you have a garden hose connected to an ordinary water tap which is opened fully. If you pinch the end of the hose, water leaves the hose at a higher speed (and this can be useful while watering plants, to reach pots which are further away). However when a tap (with no hose connected) is opened only slightly, water flows out at a low speed, possibly even in drops.  The actions of pinching the end of a hose and of almost-closing an open tap seem similar, so why the difference in behaviour? Why does this test program result in a java.lang.IllegalMonitorStateException?  public class test {     static Integer foo = new Integer(1);     public static void main(String[] args) {         synchronized(foo) {             foo++;             foo.notifyAll();         }         System.err.println("Success");     } }   Result:  Exception in thread "main" java.lang.IllegalMonitorStateException         at java.lang.Object.notifyAll(Native Method)         at test.main(test.java:6) How did humans and vulcans communicate in Star Trek: First Contact?