My computer has a error that is preventing it from booting to the desktop. The error message is      Warning failed to connect to lvmetad no such file or directory falling   back to internal scanning   It happened right after I installed GNOME, how to fix the error?
My Ubuntu laptop which was working fine until recently. My desktop disappeared and all the desktop icons are gone. All I have access to is the terminal. In an attempt to fix the problem, I installed GNOME but it made the computer give the error:     Warning! Failed to connect to lvmetad. No such file or directory Falling back to internal scanning.    I can press Ctrl+Alt+F1 to start tty1 but I can't get to a graphical user interface. What did I do wrong and how do I fix it?.  The operating system is ubuntu Linux
Extra }, or forgotten \right My MWE:  \documentclass{report}  \usepackage{amsmath}  \begin{document}  \begin{align} y &amp;= a \\ =&amp; -2c_1\bar{z}_1^2 + 2\bar{z}_1\bar{z}_2 + 2\bar{z}_2 \left ( -\bar{z}_1 -c_2z_2 - \frac{3\epsilon}{2}\bar{z}_2 -\sigma_{2,1}\cos(x_1)\Delta x_1 \notag \right. \\ \left. &amp;- \sigma_{2,2}\Delta x_2 -\sigma_{2,3} \Delta u +c_2 \chi_2 \vphantom{\frac{1}{1}} \right ) - 2\gamma \sigma_{2,1}^2\cos^2(x_1) \Delta x_1^2 - \gamma \sigma_{2,2}^2 \Delta x_2^2   - 2\gamma \sigma_{2,3}^2 \Delta u^2 \end{align}  \end{document}   The error I get:  Extra }, or forgotten \right.   The expected result: If $f(\frac{1}{n})=0$ all $ n\to \mathbb{Z^{+}}$ then find $ f'(0)$? Let $f: \mathbb{R}\to \mathbb{R}$ be a twice differntiable function and $f(\frac{1}{n})=0$ all $n\in \mathbb{Z^{+}}$? then which of the statement (s) are correct from below.  (a)$f(0)=0$  (b)$f^{'}(0)=0$  (c)$f^{''}(0)=0$  (d)$f$ is a non zero polynomial  I tried of using Tyler series but I wasn't able to do this any help would be appreciated thank Why are conference papers so important in computer science (CS)? From my understanding many CS conferences are highly selective and the papers are peer-reviewed. The CS field also seems to publish traditional journal articles. I do not understand the difference between the two and in particular I am curious about the advantages of having two different publication streams. The type of things I am curious about are:   What is the difference between a paper published in a top CS conference and a top specialist journal? Is one more prestigious than another and if so how do they line up? Why not just publish conference papers as a special issues of a journal? What should I do if two libraries provide a function with the same name generating a conflict? What should I do if I have two libraries that provide functions with equivalent names? What's the Best Practice reinstalling windows 7 on a dual boot with ubuntu 11.04 I've posted a question  that I have a 32bits windows 7 on a dual boot machine with ubuntu 10.04 upgraded to 11.04. From the responses I had from the questions, I decided to reinstall the windows 7 but this time a 64bits version.  I've install the grub on the first section of the HDD on which ubuntu is install, meaning the 2nd Drive.  I still want guidance before I proceed.  What would you suggest me as best way to achieve that without disturbing the boot loading.  thank you for reading this. How can I clear event subscriptions in C#? Take the following C# class:  c1 {  event EventHandler someEvent; }   If there are a lot of subscriptions to c1's someEvent event and I want to clear them all, what is the best way to achieve this? Also consider that subscriptions to this event could be/are lambdas/anonymous delegates.  Currently my solution is to add a ResetSubscriptions() method to c1 that sets someEvent to null. I don't know if this has any unseen consequences. Pass by Reference / Value in C++ See dashboard as non logged user in community Is it possible, as a non logged user, to see report and dashboard in community when it is open to non logged user? And  for analytic dashboards? of Stack Overflow, all content posted on Stack Exchange sites by their users (i.e. you wonderful people) has been provided to the whole universe under . For my fellow non-lawyers, that license basically means:   Anyone can use any Stack Exchange posts at any time without having to ask for permission Making money off of the copied content is permitted You don't even have to copy stuff from here verbatim; you can just use it as a starting point and make whatever edits you want There are just two rules you have to follow:   You have to provide . Simple links to the original post and author info are just fine. You have to  and allow other people to use your content, as long as they follow these very same rules. How meta!    (If you ever forget any of that, and want to refresh your memory, the license info is linked to in the footer of every page.)  There are, in fact, a lot of people who republish varying amounts of our content for assorted reasons. Unfortunately, there are some Stack Content Republishers Attributing Poorly and/or Excelling at Ranking (SCRAPERs, for short).  In this context, "attributing poorly" means any use that doesn't follow our attribution rules or make any other reasonable attempt at give credit. This can get pretty egregious; I've seen SCRAPERs that not only don't link back to SE originals, but also use fake author info and post dates to make it harder to find originals. By "excelling at ranking," I'm referring to copycat sites that end up higher in Google results than the original SE sites do for the same content. That's not necessarily wrong, but in some cases, it indicates inappropriate SEO hackery.  So, the question is: what can you do if you spot a SCRAPER? How bias arises in using maximum likelihood to determine the variance of a Gaussian? While reading , I ran into the following explanation for why there is an error in estimating the variance of Gaussian distribution using Maximum Likelihood. On ,      Illustration of how bias arises in using maximum likelihood to   determine the variance of a Gaussian. The green curve shows the true   Gaussian distribution from which data is generated, and the three red   curves show the Gaussian distributions obtained by fitting to three   data sets, each consisting of two data points shown in blue, using the   maximum likelihood results (1.55) and (1.56). Averaged across the   three data sets, the mean is correct, but the variance is   systematically under-estimated because it is measured relative to the   sample mean and not relative to the true mean.   I'm pasting figure 1.15 and the required equations (1.55, 1.56) here for convenience.  $\mu_{ML} = \frac{1}{N}\sum_{n=1}^{N}x_n$   $\sigma_{ML}^2 = \frac{1}{N}\sum_{n=1}^{N}(x_n - \mu_{ML})^2$    I can imagine how maximum likelihood estimation would look pictorially. However, I'm not able to understand the figure or the explanation. I would appreciate if someone could label the figure or explain what points are considered in each part of the figure and why the curve could look like that in each case.  I looked up , and I'm able to understand why there is a factor of $\frac{N-1}{N}$ between the true $\sigma^2$ and $\sigma_{MLE}^2$.  ${\rm I\!E}[\sigma_{MLE}^2]= (\frac{N-1}{N})\sigma^2 $ Is "Logan" the last movie with Hugh Jackman as Wolverine? has played the role of Wolverine as a major character in various X-Men films since 2000 and contributed highly to the brand of the X-Men movie series. But is he playing the Wolverine character for the last time in Logan?  I am getting to know from my friends that  is the last movie in which he is playing Wolverine and they all say that this is his last contracted film.  Are these rumors true? Is there any official information that confirms that this is Hugh Jackman's last movie as Wolverine? Understanding Tag badges I very recently earned the below badge. But I am sorry, I do not understand it.    It says      Earned at least 100 total score for at least 20 answers in the java tag.   But I have answered 140 questions under Java tag and pretty sure would have earned more than 100 points. Then why did I receive it so late. Currently I have 3.3K points on SO.  Secondly if so, I have answered about 41 questions under Scala tag, then why didn't I receive this badge for Scala? As the title suggests, I have some kit which is 200m from our current infrastructure (outdoors).  What is the cheapest way to establish a reliable connection across a 200m stretch (Cat 5e ethernet only works up to about 100m from our tests)? How to convert standard IP address format string to hex and long? Does anyone know how to get the IP address in decimal or hex from standard IP address format string ("xxx.xxx.xxx.xxx")?  I've tried to use the inet_addr() function but didn't get the right result.  I tested it on "84.52.184.224"  the function returned 3770168404 which is not correct (the correct result is 1412741344).  Thanks! What is the "wheel" user in OS X? Unable to edit my response to a locked question The image is broken in my  to the "favorite programmer cartoon" question. I'd be happy to fix this, but I can't (not enough rep? not a moderator?).  Here's the image in the Internet Archive: I generally know how to use a hyphen, but when should I use an en-dash (–) instead of an em-dash, or when should I use a hyphen (-) instead of an em-dash (—)? Why is Outlook 2010 Changing my Embedded Spreadsheet to a GIF? Years ago I figured out how to embed a spreadsheet in an Outlook email to automate a task I do regularly.  Whenever I want to send a new quote request I open an old email, tell Outlook I want to resend it, fill in the new values in my embedded spreadsheet and then send it off.  This method worked well for years.  After switching to a new computer however, I have found that when I open the latest emails I have sent, I cannot edit the embedded spreadsheet because Outlook interprets it now as a GIF.  Saved emails that I sent with the old computer however, still work fine - I can still open, edit and resend and Outlook interprets the embedded spreadsheet correctly.  I would like to figure out how to setup Outlook in the new PC correctly so that the embedded spreadsheet is interpreted correctly when the email is reopened. Some sort of security setting, maybe?  Any help anyone could provide would be appreciated.  Edit: I developed the spreadsheet originally in Excel. Then I went into Outlook, created a new email, did Insert->Object->Excel Spreadsheet. At that point I had a blank spreadsheet in my email. Then I copied and pasted the spreadsheet from Excel into the blank spreadsheet in Outlook and it worked perfectly (until this recent problem) Partial instead of full markers are shown in PGFplots When using  \documentclass{article} \usepackage{pgfplots} \begin{document} \begin{tikzpicture}         \begin{axis}                     \addplot             [                 red,                 solid,                 mark=x,                 domain=-3e-3:3e-3,                 samples=50             ]              {exp(-x^2/(2e-3^2))/(1e-3*sqrt(2*pi))};         \end{axis}     \end{tikzpicture}    \end{document}   the markers look fine, see    , but when I replace solid with, for instance, loosely dashed, so  \documentclass{article} \usepackage{pgfplots} \begin{document} \begin{tikzpicture}         \begin{axis}                     \addplot             [                 red,                 loosely dashed,                 mark=x,                 domain=-3e-3:3e-3,                 samples=50             ]              {exp(-x^2/(2e-3^2))/(1e-3*sqrt(2*pi))};         \end{axis}     \end{tikzpicture}    \end{document}   the markers only show partially instead of fully, see    . How can I use loosely dashed with full markers showing? Please provide a Moderators table in the Data Explorer