I am a newbie in Ubuntu. I'm trying to install Texmaker, but can't solve some issues of missing dependencies.  I tried to install one of them: libqt5core5a:  The following packages have unmet dependencies:  libqt5core5a : Depends: libdouble-conversion1 (&gt;= 2.0.0) but it is not going to be installed                 Recommends: qttranslations5-l10n but it is not going to be installed  texmaker : Depends: libqt5gui5 (&gt;= 5.8.0) but it is not going to be installed             Depends: libqt5network5 (&gt;= 5.0.2) but it is not going to be installed             Depends: libqt5printsupport5 (&gt;= 5.0.2) but it is not going to be installed             Depends: libqt5script5 (&gt;= 5.6.0~beta) but it is not going to be installed             Depends: libqt5widgets5 (&gt;= 5.7.0) but it is not going to be installed             Depends: libqt5xml5 (&gt;= 5.0.2) but it is not going to be installed E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).   Try to fix it:  sudo apt-get -f install   Got Error 404  Err:1 http://security.ubuntu.com/ubuntu bionic-security/main amd64 libqt5core5a amd64 5.9.5+dfsg-0ubuntu2.1 Err:404  Not Found [IP: ]   I tried to fix it with the information I found in forums but I didn't work.  Please if you could give some help.  Thanks.
There are now errors when updating and I cannot install most software due to a corrupted  /etc/apt/sources.list   file. Is there a copy I can download to replace it?  The file would be for Ubuntu 12.04 (Final Beta) in the United States.
Summarize the mathematical problem at the heart of breaking a Curve25519 public key It's pretty easy to generate a Curve25519 private key: generate 32 random bytes of data and then do:  e[0] &amp;= 248 e[31] &amp;= 127 e[31] |= 64   You can then generate a public key by doing  on the private key. For example, here's a random keypair I just generated:  public: e40ed268dff20db8497d0691421d00b086aad1efedcd5bd223d9eb6c0b85665f secret: e3c0e8b20ba7894882ddb37522dbe90867befcf9f31a5ce29c0d7997e0bd856d   The whole safety of public key encryption is that it is hard to take a public key and reverse the operation. Elliptic curve cryptography, as I understand it, relies on the fact that a  is hard to find. In particular, for a given large b and g, it is hard to find an integer k such that  $b^k = g$  How does that equation relate to Curve25519? Specifically, if I had a public key like the one above, how would I express, in math terms, the problem I need to solve to find the private key? How does it relate to the equation I see from time to time - $y^2 = x^3+486662x^2+x$, and the number $2^{255} - 19$?  I am guessing it is not as simple as "the private key is k and the public key is b and/or g" in the equation above. I'm also a little confused because the keys would appear to have roughly the same number of digits, which would seem to imply that there aren't many feasible values for k? Highlighting the selected tab using jQueryUI Tabs I have a header page with links to all the visualforce page as tabs.I need to highlight the tab on select of it.      &lt;apex:page title="{!$Label.site.site_login}" showHeader="false" sidebar="false"       standardStylesheets="false"&gt; &lt;apex:includeScript value="{!URLFOR($Resource.jQuery, '/js/jquery-1.4.2.min.js')}"  /&gt;   &lt;apex:includeScript value="{!URLFOR($Resource.jQuery, '/js/jquery-ui-1.8.6.custom.min.js')}"  /&gt; &lt;apex:stylesheet value="{!URLFOR($Resource.jQuery, '/css/ui-lightness/jquery-ui-1.8.6.custom.css')}"  /&gt;          &lt;html lang="en"&gt;  &lt;head&gt;   &lt;script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"&gt;  $(function()  {   $( "#tabs" ).tabs();   });  &lt;/script&gt;   &lt;style&gt;   #tabs .ui-tabs-active    { background: red; }  &lt;/style&gt;     &lt;/head&gt;      &lt;body&gt;         &lt;nav class="navbar navbar-static-top navbar-inverse" role="navigation"&gt;             &lt;div class="container"&gt;                 &lt;div class="navbar-header"&gt;                     &lt;button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"&gt;                         &lt;span class="icon-bar"&gt;&lt;/span&gt;&lt;span class="icon-bar"&gt;&lt;/span&gt;                         &lt;span class="icon-bar"&gt;&lt;/span&gt;                      &lt;/button&gt;                     &lt;a class="navbar-brand" style="line-height: 0px; padding: 10px 15px;" href="index.php.html"&gt;                         &lt;img height="30px" src="{!URLFOR($Resource.Resources, 'img/logo.png ')}" /&gt;                     &lt;/a&gt;                 &lt;/div&gt;                 &lt;div class="collapse navbar-collapse navbar-ex1-collapse" id="tabs"&gt;                     &lt;ul class="nav navbar-nav"&gt;                         &lt;li id="Home"&gt;                             &lt;apex:outputLink value="{!$Page.Home}"&gt;Home&lt;/apex:outputLink&gt;                         &lt;/li&gt;                         &lt;li id="chatter"&gt;                             &lt;apex:outputLink value="{!$Page.Chatter}"&gt;Chatter&lt;/apex:outputLink&gt;                         &lt;/li&gt;                         &lt;li id="page3"&gt;                             &lt;apex:outputLink value="{!$Page.page3}"&gt;Room&lt;/apex:outputLink&gt;                         &lt;/li&gt;                         &lt;li id="page4"&gt;                             &lt;apex:outputLink value="{!$Page.page4}"&gt;Page4&lt;/apex:outputLink&gt;                         &lt;/li&gt;                     &lt;/ul&gt;                 &lt;/div&gt;             &lt;/div&gt;         &lt;/nav&gt;     &lt;/body&gt;      &lt;/html&gt; &lt;/apex:page&gt; I find today that I can no longer mount my Netgear ReadyNas drive because apparently it is using SMB1 and Windows 10 have disabled since release 1709. This is very problemaic because I need to access these files and because I have lost the admin password for the ReadyNas itself so I cannot login in order to update/reconfigure it to use SMB2 instead.  Microsoft refers me  to  which in turn refers me to  if I really want re-enable SMB1  And I successfully did re-enable SMB1 by running  Enable-WindowsOptionalFeature -Online -FeatureName smb1protocol   from Powershell as Adminstrator.  However even after reboot I still cannot re-establish connection to my Netgear from Windows Explorer, it gives the same error  What else do I need to do ?  PS C:\WINDOWS\system32&gt; Get-WindowsOptionalFeature –Online –FeatureName SMB1Protocol   FeatureName      : SMB1Protocol DisplayName      : SMB 1.0/CIFS File Sharing Support Description      : Support for the SMB 1.0/CIFS file sharing protocol and the Computer Browser protocol. RestartRequired  : Possible State            : Enabled CustomProperties :                    ServerComponent\Description : Support for the SMB 1.0/CIFS file sharing protocol and the Computer                    Browser protocol.                    ServerComponent\DisplayName : SMB 1.0/CIFS File Sharing Support                    ServerComponent\Id : 487                    ServerComponent\Type : Feature                    ServerComponent\UniqueName : FS-SMB1                    ServerComponent\Deploys\Update\Name : SMB1Protocol   Solution  Thanks Bob, SMB 1.0/CIFS File Sharing Support was enabled but within it SMB 1.0 Client was not enabled, checking that box and rebooting fixed the issue. Google sheets split multi-line cell into new rows (+ duplicate surrounding row entries) I'm compiling a database of business address info, including key staff for each business. The Google spreadsheet I've inherited for this project includes a column for 'key staff' (in column B), with multiple key staff names listed in the same cell, separated by line breaks (ie CHAR(10) ). There is one business per row. The number of lines in the 'key staff' cell varies row-by-row.  My initial sheet looks like this:    I need to do the following to optimize this sheet:   split each multi-line ‘key staff’ cell so each key staff name appears on its own row. This requires that new row/s be inserted beneath the original row. duplicate the data from all other cells on the original row (i.e. from columns A &amp; C:E), so that each new row contains the full data for each business I need an automated process - I'll have about 1000 businesses to process so can't do this with any manual steps   The sheet should then look like this:    Using =TRANSPOSE(SPLIT(B1,CHAR(10))) obviously only goes part of the way - it doesn’t insert new rows and doesn’t duplicate the surrounding column entries. All help gratefully accepted! Ability to give away iOS application, usually for sale I am wondering if it's possible to do "mass giveaways" on the AppStore, without lowering, changing or otherwise changing the listed application.  Is it possible to distribute hundreds to, potentially, thousands of promo codes, legally, while still leaving the "normal" distribution channel of purchasing the app open?  An example of the above would be selling physical items in a store which have a bundled digital component available. Essentially you buy a product in a store, which comes "bundles with a free app" (BB and Android have already been dealt with, iOS is unclear). It would be nice to give the option to have a promo code in the box, that the user can then use to get the application for free. Is this possible? Let $G\times K$ be a finite group. Suppoose $G\times K\cong H\times K$. Is this sufficient to imply $G\cong H$? Is there a possibility of using REST Assured library for testing SOAP webservices? I have a bunch of Test Suites in SOAP UI and I need to check if there is possibility of using REST Assured. Can anyone suggest if this is possible? Many thanks for any comments. Awk: if pattern not found add some text at the end of file What is the best choice for .NET inter-process communication? Is there a general formula for finding the primitive of $$e^{ax}\sin(bx)?$$  I've done this manually with $a=9$ and $b=4$ using Euler's formulas. But it takes a bit of time. Is there a pattern here? What is the difference between class and instance attributes? 3d transforms on SVG element Why is the Yang-Mills gauge group assumed compact and semi-simple? What is the motivation for including the compactness and semi-simplicity assumptions on the groups that one gauges to obtain Yang-Mills theories?  I'd think that these hypotheses lead to physically "nice" theories in some way, but I've never, even from a computational perspective. really given these assumptions much thought. Do there Exist Proper Classes that aren't "Too Big" Some proper classes are "too big" to be a set in the sense that they have a subclass that can be put in bijection with $\alpha$ for every cardinal $\alpha$. It is implied in  post that every proper class is "too big" to be a set in this sense, however I have been unable to prove it. It's true if every two proper classes are in bijection, but it's consistent with ZFC for there to be a pair of non-bijective classes.  So, is the following true in ZFC:     For all proper classes, $C$, and $\alpha\in\mathbf{Card}$, $\exists S\subset C$ such that $|S|=\alpha$?   If not, is there something reasonable similar that preserves the intuition about classes that are "too big to be sets"? Group posts by year, then by month How do you mark a struct template as friend? When is a CDATA section necessary within a script tag? Are CDATA tags ever necessary in script tags and if so when?  In other words, when and where is this:  &lt;script type="text/javascript"&gt; //&lt;![CDATA[ ...code... //]]&gt; &lt;/script&gt;   preferable to this:  &lt;script type="text/javascript"&gt; ...code... &lt;/script&gt; qt4 / libqt4-* in Ubuntu 20.04 Detach (move) subdirectory into separate Git repository Can I stop 100% Width Text Boxes from extending beyond their containers? Lets say I have a text box that I want to fill a whole line. I would give it a style like this:  input.wide {display:block; width: 100%}   This causes problems because the width is based on the content of the text box. Text boxes have margin, borders, &amp; padding by default, which makes a 100% width text box larger than its container.  For example, here on the right:    Is there any way to make a text box fill the width of its container without expanding beyond it?  Here is some example HTML to show what I mean:  &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" &gt; &lt;head&gt;     &lt;title&gt;Untitled Page&lt;/title&gt;     &lt;style type="text/css"&gt;         #outer{border: 1px solid #000; width: 320px; margin: 0px;padding:0px}         #inner{margin: 20px; padding: 20px; background: #999;border: 1px solid #000;}         input.wide {display:block; margin: 0px}         input.normal {display:block; float: right}     &lt;/style&gt; &lt;/head&gt; &lt;body&gt;     &lt;div id="outer"&gt;         &lt;div id="inner"&gt;             &lt;input type="text" class="wide" /&gt;             &lt;input type="text" class="normal" /&gt;             &lt;div style="clear:both;"&gt;&lt;/div&gt;         &lt;/div&gt;     &lt;/div&gt; &lt;/body&gt; &lt;/html&gt;   If this is run, you can see by looking at the "normal" text box that the "wide" text box is sticking out beyond the container. The "normal" text box floats to the actual edge of the container. I'm trying to make the "wide" text box fill its container, without expanding beyond edge like the "normal" text box is.