I am using Ubuntu 14.04.  I want to change the password of the root account. I tried the following procedure:   Login with my own account (that has the sudo permission) sudo su root passwd   Enter the new password twice. I confirmed it said passwd: password updated successfully  exit Trying to login root account with the new password via SSH --> FAIL!   Why passwd command does not work here?
I´d like to enable the ssh root access on Ubuntu 14.04. Editing the /etc/ssh_config (PermitRootLogin yes) didn't affect anything.
"The ones" or "those"? I recently corrected  &quot;ghettos, such as the ones found...&quot; to &quot;ghettos, such as those found...&quot;  Was I correct, or are both versions right? Is there any way to accept only numeric values in a JTextField? Update Garmin Nüvi 255 maps Why is the word 'number' abbreviated to 'No.' in UK English and '#' in American English? Where can I ask a question about finding general software that meets certain requirements? I have a list of requirements for a program, but I don't know what program meets these criteria. That's about general-purpose software, for example, not a programming IDE or statistical workbench, questions about which would certainly go to respective sites.  Is this question appropriate on Stack Overflow? Where should I ask about it? On Super User or elsewhere? I updated the image in my Gravatar but my old picture still shows up.  Is this a cache issue?  Do I need to log out and then log back in? completing the square for Gaussian multivariate estimation I have been trying to derive the posterior distribution in the case of weighted Bayesian regression in the case of multivariate normal distribution for a few days and have been stuck. I am not sure if this is due to lack of my linear algebra skills or if I have done something really wrong.  In my case, the distributional assumptions are:  $$ y = N (B x, W^{-1} \nabla) $$  The parameters $B$ have a normal prior.   $$ P(B) = N (B_0, \Sigma_{B}) $$  The conditional posterior distribution for $B$ is proportional to $P(y|B) P(B)$. This is proportional to:  $$ \exp \big((B - B_0)^T \Sigma (B - B_0) + (y - Bx)^T \nabla (y - Bx)\big) $$  I have seen the textbooks mention something called completing the square which as far as I can tell equates to matching like terms. Even though I could work out for scalar variance terms, I am having trouble figuring out how to deal with the precision matrices and how this can be decoupled.   [EDIT]:  So, I tried to make a run with Glen_b's suggestion and came this far:  Original expression without the exponential (I will simplify notation slightly):  $$ (B - B_0)^T \Sigma (B - B_0) + ( y - Bx)^T \nabla (y - Bx) $$ Expanding:  $$ B^T\Sigma B - 2 B_0^T \Sigma B + B_0^T \Sigma B_0 + y^T \nabla y - 2 y^T \nabla B x + (Bx)^T \nabla Bx $$  $$ = B^T(\Sigma + x^T \nabla x)B - 2 (B_0^T \Sigma B + y^T \nabla B x) + C $$  So I am not sure how to make further progress with the second term. I guess I have to make it in the form 2(some_term)B but not sure how that can be done. I have an issue with my website: Google isn’t using my meta description, instead it’s using the content of the web page and I’m really confused.  Reason I’m confused is because I have checked and I don’t have duplicate page titles, description nor keywords, neither do I have any robots.txt for my website. My page title, description and keyword is unique, and page description is about 150 characters.  I have my site in Google Webmaster Tools and I checked for errors, but found none.  So I really don’t know why Google Search isn’t using my meta description. Are there regional distinctions in how hiccup/hiccough is spelled? Can older cards that refer to a player/opponent ever be used on planeswalkers? "In" and "on": How can I decide which one to use for vehicles? Examples:   In a car, van, etc. On a bus, boat, motorcycle, etc.   How can one decide which preposition to use? Is memorization the only way or is there a better way?  Note: People generally explain this by either distinguishing between open and closed vehicles or between large and small vehicles. However, the examples I've given defeat both explanations. Word for resembling the truth How do we refer to the act of resembling the truth, regardless if it is indeed the truth?  Some context: suppose you are watching a film and the story bears a striking resemblance to "real life". Perhaps you remember similar events from your own background or the story has a strong internal coherence. So you feel that the story could be true, even though you know it is fictional. Or, as the legend has it, when Michelangelo finished his "Pietà" and the sculpture seemed so "real" and "natural" to him, that he was amazed that the sculpture couldn't talk. One last example: you hear the promises of a politician in election campaign and he seems to be telling the truth, but of course you have no way to figure out, beforehand, if he is being honest or not.  The word "likelihood" comes to mind, but this word suggests some kind of numerical (even statistical) evaluation, which is akin to "probability". The word I am looking for describes the feeling you get, which leads to a subjective "binary" judgement (either it resembles the truth or not).  In Portuguese, such word is "verossimilhança" (from Latin verum, truth + similis, similar). Steam doesn't start after upgrade to Ubuntu 16.04 After upgrade to Ubuntu 16.04, Steam doesn't start. When I execute it from the command line, I get the following error:  $ steam Running Steam on ubuntu 16.04 64-bit STEAM_RUNTIME is enabled automatically grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc Installing breakpad exception handler for appid(steam)/version(1459463254) "Give a hand" vs "Help" Currently, I'm working in an international company with many non-native speakers (so am I) but with pretty good level of English, I suppose.  I have noticed that my colleagues usually use phrase "give a hand" when asking for  help or even talking about it and seems to be avoiding the strong word "help".  It looks a bit confusing to me especially after I made people laugh when I said  "I will help you" in one of our conversations, don't remember exact context though...  So could you please describe the difference between them? And is there something wrong or hidden meaning with help-based phrase? Does $\mathbb R^2$ remain connected when countably many points are removed? Does it remain path connected?  This is not homework but is in response to working several problems where countable or uncountable many points are removed and the pattern always holds.  Thank you. How to view/erase images from both CF and SD cards on Canon EOS 5D mk3? I've been trying to setup my Canon EOS 5D mk3 to shoot in "backup mode". I have two cards:    32GB CF  8GB SD   I've set it like the following:  SET UP1 menu ------------ Record func.:       Rec. separately Playback:           1 [CF]  SHOOT1 menu ------------ Image type/size CF: RAW 22M Image type/size SD: JPEG 9,8M   It works ok, except I have one problem. Since I have only these two cards, on some large shoots I need to erase some in order to free some space to make the card last till the end of shoot.  When viewing images and deleting the ones I want to delete, it seems that I can only see the contents of the CF card, and when I delete an image I delete only the RAW file saved on the CF.  Is there a way to delete the JPEG from the SD card along with it's RAW "parent" on the CF card? I'm getting into English recently and I'm a little confused by the way people pronounce a word that starts in a vowel right after a word ending in -ing.  For example:      You have to bring it up now?   I don't know if I should pronounce it as:   bring /ŋit/ brin' /nit/ bring /git/   Another example would be "I'm coming out".  Likewise, what about the ending -ang? For example:      We can just hang out and have a good time.    And to round it all up, what about a combination of the two? For example,      He got sick of hanging around waiting for you and went home.   I've been asking myself these questions for weeks. On Linux can I keep a program running in background even after I disconnect? If I'm logged into a remote Linux machine, I know I can suspend a process (cntr-z) and move it to the background (bg 1) but if I disconnect from the machine, the process stops.  Is there a way I can leave it in the background and have it there when I log back in? This is a very long running process.  On Ubuntu, logged in via SSH. When I use the mobile app to vote for an answer that was awarded a bounty,  the bounty is no longer shown until I reload the answers. Is there a built-in checksum utility on Windows 7? Is there a built-in checksum/hash utility on Windows 7?