I am trying to access an Ubuntu server using SSH. I haven't changed my username and password. I have been accessing it using SSH for a while now. When I write a command like: ssh administrator@1.1.1.1 and insert a password, I get the error:Permission denied. Can anybody please help?  Thanks.
I'm trying to connect to another computer in my house via ssh. Both computers have ubuntu and openssh installed. When I run the command "ssh username@ip" on terminal I'm asked for the user's password I'm trying to connect to. I type it but I get this error "Permission denied, please try again." I'm sure the password is correct, then why can't I access?
Why does the natural ring homomorphism induce a surjective group homomorphism of units? I'm trying an old problem here:   Suppose $n\mid m$, and I have a natural ring homomorphism $\varphi\colon \mathbb{Z}/m\mathbb{Z}\to\mathbb{Z}/n\mathbb{Z}$ defined by $\varphi(j)=j\mod{n}$. I can verify that this is a ring homomorphism, but why does it induce a surjective group homomorphism on the unit groups $(\mathbb{Z}/m\mathbb{Z})^\times\to(\mathbb{Z}/n\mathbb{Z})^\times$?  My question in particular is why is it surjective? I take $k\in(\mathbb{Z}/n\mathbb{Z})^\times$. Then there exist integers $s,t$ such that $sn+tk=1$. Since $n\mid m$, I can also write $m=na$. So multiplying through I get $sm+tka=a$. I'm lost here. How can I find a unit in $(\mathbb{Z}/m\mathbb{Z})^\times$ which maps to $k$ to show surjectivity? How old is SpongeBob? I don't mean how old is the series, I mean what is SpongeBob's age if he were a real person. I ask because his age seems to be ambiguous in the show.   He has a full-time job He has his own house He is always referred to as a kid (especially in the movie) He acts childish and immature In one episode, he was pretending to be an adult/grown-up What is IEEE 802.3 Ethernet's communication type: Synchronous or Asynchronous? In the IEEE 802.3 frame structure there is a 7 byte preamble section for synchronization. If it is really for synchronization does that mean Ethernet is synchronous and not asynchronous?    Ethernet structure for reference: Strange object.ray_cast() behavior object.ray_cast() is not behaving as I would expect in Blender 2.77. I understand that it expects object local coordinates, but this problem happens when the object is not translated, rotated, or scaled.  If I edit the shape of the cube mesh without moving the cube, the results of ray_cast() seem plain wrong.  Steps to reproduce   Create a cube at 0,0,0 Move a vertex of the cube from 1,1,1 to 5,5,5 Create an empty called "src" at 2,2,2 Create an empty called "dst" at 2,2,6   Run this python  cb = bpy.data.objects['Cube'] src = bpy.data.objects['src'] dst = bpy.data.objects['dst'] hit, loc, norm, face = cb.ray_cast(src.location, dst.location) bpy.ops.object.empty_add(location = loc)   This is the result on my system. The new Empty created at the interesection point is selected:    The source and the destination are both at x = 2 and y = 2. The cube has a surface at x = 2 and y = 2. So why on earth is the intersection point at x = 2.22222, y = 2.22222? App Store on Mojave: "We could not complete your purchase. cancelled" Whenever I try to Get then Install any app from the App Store, I get this message:     We could not complete your purchase.  cancelled   I did some searching online, but barely found any useful hits. What is this about?! If I replace my main panel, will I need to fit AFCIs? This question is about whether "circuits" can be grandfathered if the breaker or panel is changed but the circuit is otherwise not disturbed.   Code is NEC 2017.  My existing main panel has plenty of ampacity but few spaces, and thus, is totally full.  I have several potential paths for an upgrade.    One involves fitting a subpanel and moving 4 circuits (2 double-stuff breakers) there, and adding circuits there.    The other involves outright replacing the main with a very fine 60 space main panel.  No more space problems!  But what happens with AFCI and GFCI requirements? If this were a new house,  nearly all my circuits would require it, but I am grandfathered.  Will the  "new main" scenario void the grandfathering and require that nearly all circuits be upgraded to that protection?   Or can I just move over my old breakers and call it good? How do I create an internet shortcut within a folder? What do two question marks together mean in C#? Ran across this line of code:  FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();   What do the two question marks mean, is it some kind of ternary operator? It's hard to look up in Google. I'm trying to fix the following TikZ figure, where the circle device in the middle should be embraced by two bended arrows pointing counter-clockwise.    I have drawn these arrows with an arc path, but the tips of the arrows are unexpectedly both pointing upward.  Any idea how to get these arrow tips to follow the direction of the arc?  Here is my code for the above figure:  \documentclass[12pt]{article}  \usepackage{tikz} \usetikzlibrary{arrows} \usetikzlibrary{calc}  \begin{document} \begin{tikzpicture}   \draw (0,0) circle (1cm);   \draw[fill=gray!20]  (23:0.45cm)     -- (23:1cm) arc[radius=1, start angle=23, end angle=-203] (157:1cm)     -- (157:0.45cm) arc[radius=0.45, start angle=157, end angle=23] (23:0.45cm);   \draw[fill] (0,0) circle(2pt);   \draw[-&gt;,&gt;=stealth',semithick] (150:1.2cm) arc[radius=1.2, start angle=150, end angle=210] (210:1.2cm);  \draw[-&gt;,&gt;=stealth',semithick] (-30:1.2cm) arc[radius=1.2, start angle=-30, end angle=30] (30:1.2cm);   \foreach \x/\y in {1/0,2/0,3/0,4/1,5/1,6/1,7/0,0/1}     \node[rotate={\x*45-90}] at ($(0,0)!.75!\x*45:(1,0)$) {\y} ; \end{tikzpicture} \end{document} Is it possible to do The Pitt without a slave outfit? How is it like to live in Helsinki?  What is it like to live in Helsinki?  How is living in Helsinki?  What are the differences between these three sentences and what is the common way to ask someone for their opinion about the city they live in? What's the best way to check if a file exists in C? Restart my graphics card without rebooting? \begin{eqnarray*} M&amp;=&amp; \max{\left \{a,b,\frac{a+b}{2},\right}\\ &amp;&amp; a+b,a+b/2\Bigg\} \end{eqnarray*} Objective-C Blocks and variable scope So, Can linking verbs be used with "continuous tenses"? When & How often do 4e Monster powers recharge? How often should I roll power recharge rolls and at which point in the monster's turn do I re-roll them?  I'm trying to find the official definition of the recharge mechanic in the online compendium and I'm not seeing it there. Why doesn't xpath work when processing an XHTML document with lxml (in python)? I have a common scenario in app design, where I need to store an ordered list, and make the ordering easily accessible and adjustable via an application UI.    The ordering operations are simple and operate on only one item at a time - move to top, move to bottom, move up one position, or down one position.  These positioning operations may be interspersed in with typical add / edit / delete list operations.  For discussion, this is a single-user app and db store.  Because the objects can be highly complex, I'd like to avoid caching the entire list client-side, and tracking newly created objects in memory until a big save operation occurs.    I am using MS-SQL almost exclusively on these projects, and I'm wondering if there are db features, SQL features, or design patterns I should be using to better support the management of ordered lists.    My current approach is to use a DECIMAL column to store the list positions, which become fractional during the item move process.  Then I sort the list and re-generate integer positions to normalize list.  Following this operation, it's ready for another item move.   In an example implementation, I create a column named Seq for position tracking.  Once decimal place is enough for the .5 storage.   [Seq] [decimal](10, 1) NOT NULL   When an item is re-positioned in the app UI,    I UPDATE that record with new Seq value I retrieve the full table, sorted ascending by Seq and regenerate all Seq values in the table from a 1-based integer series   The new Seq value is easily calculated-    Move to top = 0 Move to bottom = MAX(Seq) + 1 Move up = subtract 1.5 from the current Seq value Move down = add 1.5 to the current Seq value   As lists get longer, updates get slower, since I'm doing N UPDATE statements, where N is the number of rows in the table, so it seems only suitable for small tables.    Is there some kind of in-built capability for managing an ordered list in SQL or MS-SQL? Is there a means to update multiple rows in one call?    A far more performant approach would be to allow more decimal places, and then position at the median of the two adjacent items, with no re-sequencing on the list.     Move to top = Min(Seq) - 1 Move to bottom = MAX(Seq) + 1 Move up = median of the 2 previous item Seq values Move down = median of the 2 following item Seq values   This approach only requires one SELECT (containing 2 rows max) and one UPDATE.    However with enough re-positions I imagine the field would run out of decimal places. For example, if I start with items at positions 10 and 11, and keep moving items down the list from position 9, they'd be given sequences of 10.5, then 10.25, then 10.125.  After 10 moves, the positions get lengthy... 10.0009765625.    UPDATE #1 - IMPROVED RE-SEQUENCING OF THE LIST  Regarding re-sequencing, I'm more caught up on row_number(), OVER, and WITH capabilities in MS-SQL.  It's nice to find that there's a much smoother way to re-sequence the list in a single UPDATE operation;  with OrderedItems as  (     select         ItemID,         Seq,         row_number() over (order by Seq asc) NewSeq     from          Items ) update OrderedItems set Seq = NewSeq is there a way to add hyperlinks in a Illustrator document? I am creating a CV in Illustrator and exporting it to a PDF. I just read an article which stated that it is a good idea that we use hyperlinks in the CV so that the employer can just click and not have to copy the address. I like this idea, but I don't know how to add a hyperlink to text in Illustrator. Is it possible?