I installed ubuntu about a year ago and yesterday I deleted the partition, because my parents were annoyed with the startup menu. I didn't know that I had to fix the 'mbr'.    Now every time I try to boot the computer the grub menu pops up and says that the partition  cannot be found. I made an ubuntu dvd but it doesn't turn on automatically and I have no clue how to do it manually.   Please help me, I have no clue what to do. Could someone at least tell me how to retrieve data or documents.
I have absolutely no experience with Linux, and I desperately need to get my computer back up and running again with Windows.  How do I remove Ubuntu and reinstall Windows?    Editor's note: many of the answers are about removing Ubuntu from dual-boot but keeping Windows (which is a bit complicated), while other answers are about removing Ubuntu from single-boot (which is easy: basically just format the disk while installing Windows). The question as written is ambiguous between dual-boot or single-boot.
Is there a new auto-login feature? If mastery of the Force is hereditary, how are the Jedi so numerous? How to set shell to wrap words for long commands? "No root file system defined" error while installing ubuntu I am new to linux/ ubuntu and just downloaded the v11 of ubuntu to learn linux. I faced this "No root file system is defined" error while trying to install it. This is how I was proceeding -    Downloaded ubuntu v11 from the ubuntu.com website, wrote the iso into a bootable cd, and then got into the linux installation process on restarting; everything fine till here. In one of the screen during installation, there are three choices - install alongside windows, something else etc.. Since I have windows 7 in the C drive, I selected the first option - "Install alongside another OS".      Let me interrupt here to give my existing system details - HardDisk   size: 640GB.  Number of existing partitions - 5 C drive - label   windows - 160GB - has windows 7 installed D drive - label linux -   160GB - does not have any data E drive - label backup - 100GB - has   some data F drive - label entertainment - 100GB  - has some data G   drive - label work - 90GB  - has some data All of the above are in   NTFS format.    In the screen that follows, an image is shown with 2 parts and each part is shown to have size equal to 80GB. There is a horizontal slider in the middle of these two images, with which I can resize the partitions. The right side partition is labeled Linux. There is also an option to do 'advanced partitions'. On clicking advanced partitions on the above screen, a new screen is shown in which the partitions existing in my computer are shown - but the labels are different. I see that there are two partitions with size = 160GB each (as expected), and so I assumed that the first 160GB would be my existing C drive and the second on would be the partition which I had labeled as linux (drive D). So I selected the linux partition and clicked on proceed/ install now, and then this error was shown - "No root file system defined".. and I cannot proceed after this.   Please let me know two things here:   During the screen in point number 3 above, the image with slider was shown. Which partition (drive c: or d: or anyother) is being referred to here? Which one am I actually resizing - is it the existing c: drive which has windows 7 installed already, that is getting shrunk and then ubuntu getting installed in the remaining space? What does ""No root file system defined" error mean? How do I select the proper partition and continue with the installation?    P.S.:  I had already partitioned my drives as mentioned above, and the D drive with 160GB was specifically left free for installing ubuntu. I would like to Select D drive during setup and install ubuntu here, while still keeping the already installed windows7 in C drive.  Thanks! Replacing NAs with latest non-NA value In hearthstone, you receive one quest per day, barring unique quests. What I'm wondering is when exactly does a new day start? I assume it's at a specific global time, so I'm looking for a time in GMT or UTC.  I did find out you need to exit the game and come back to receive new quests, but I'm hoping someone actually knows when i have to do that. Do the Faceless Men take more than just a face? I've got a domain that I apparently forgot to set a preferred domain for, so I just tried to do it. Webmaster Tools instead popped up a little box:     Part of the process of setting a preferred domain is to verify that you own http://www.example.com/. Please verify http://www.example.com/.   I'm running into some problems following these instructions:   As far as I can tell I already did verify sometime in the past. There's a TXT DNS record with the gibberish Google tells you to set for it that I couldn't have come up with myself. …and nothing is telling me this information is bad. So let's assume the site is somehow not actually verified. All  instructions start with "click the Manage Site button next to the site you want, and then click Verify this site." That button doesn't even exist on my screens. (It presumably goes away when you successfully verify?) Those instructions were all updated pretty recently, and the DNS one in particular just a couple weeks ago so it seems a bit unlikely they're inaccurate.   I am not using Apps, and won't be, so can't try out the verification .   Note that I also have another domain that I have not done any verification for which is showing the same behavior(no such button, being told to verify when it seems impossible etc.) so something appears to just be broken.  I already have a no-www process in place server-side, so we can skip that. I'm just trying to get the box checked off in GWT.  If I don't get any resolution, I'll eventually scrap the TXT record and see if the site gets un-verified(or whatever since it thinks it isn't), and see if I can just restart the process.  It's not urgent so I'm just trying to figure out if I've gone blind to something or what. Did the button move? Why was Sam Wilson chosen for this, but not Bucky? At the end of the Avengers: Endgame movie,      old Steve Rogers passed down his mantle of Captain America   to Sam Wilson.  Why didn't he choose Bucky for this? Bucky seems more fit for the job as he is a super soldier. Time ordering operator if commutator is $c$-number function How to add custom C++ keywords to be recognized by Minted? I have defined several structures and types in a C++ project. I have to write some documentation for this code, and I use  to typeset my code.   I would like to be able to add some keywords to the minted database, so minted will also recognize these and give them the appropriate color. (I would like to have them colored in the same way a type, eg. double would be colored.) In bash, read after a pipe is not setting values With ksh I'm using read as a convenient way to separate values: $ echo 1 2 3 4 5 | read a b dump $ echo $b $a  2 1 $  But it fails in Bash: $ echo 1 2 3 4 5 | read a b dump $ echo $b $a     $  I didn't find a reason in the man page why it fails, any idea? Can bounties be awarded multiple times by the same person on the same question? Is there any restriction to prevent multiple bounties ( not simultaneously) being awarded to different answers on the same question ?  i.e., on a question  -  I want to set multiple bounties since I've received 2 awesome answers. Can I set award a bounty on answer A first, and then set the bounty and award it to answer B ? What is the difference between DX format and FX format lenses, and which to choose for what purpose? What is the difference between DX format and FX format lenses, and which to choose for what purpose?  What are the pros and cons of both? I'm having some problems with some scripts in bash, about errors and unexpected behaviors. I would like to investigate the causes of the problems so I can apply fixes. Is there a way I can turn some kind of "debug-mode" for bash, to get more information? I'm in the following situation: In 3 months, I'll finish my PhD in theoretical physics, and I'm certain that I want to pursue an academic career. However, I'm just as certain that my PhD research is a dead end. (My advisor doesn't think so, but I disagree with him.) Thus, I seek to change the direction of my research, but I need a few months to obtain the necessary skills. Anyway, I missed the main application period for post-doc positions (in the US).  Given the following options (feel free to expand this list), which do you think provides the best perspective of leading me to a interesting post-doc position?   Finish my PhD. Get any post-doc position. Do the work I'm required to do there. Work hard in my spare time to teach myself the stuff I want to. After 1-2 years, find a post-doc position I'm really interested in. Finish my PhD. Get a well-paying job in the software industry. Do the work I'm required to do there. Work hard in my spare time to teach myself the stuff I want to. Work harder to keep publishing papers. After one year, find a post-doc position I'm really interested in. Abort my current work. Find a new subject and a new PhD advisor. Live on unemployment money as long as possible. Work hard in my spare time to teach myself the stuff I want to. Work harder to keep publishing papers. After one year, find a post-doc position I'm really interested in.   Pros:   Get the PhD title sooner. Stay in the scientific community. Get the PhD title sooner. Earn lots of money (6 figure). In a 9-to-5 job, have more spare time for private research than on a post-doc position, where work is never finished. Go to a foreign country. It's what I should've done 2 years ago. I'll have the education I want when I finish my PhD, not later (but be older anyway). No immediate advantages over the other options.   Cons:   If a logical continuation of my PhD work, I'll suffer from demotivation. My next advisor will not want me to work on other topics that I'm not paid for. Might have to stay for 2 years. I'll move out of the scientific community for some time. I know it's hard to get back in. I'll be even older when I finally get my PhD. Not sure if I would find another advisor. Open fight with my current advisor. I don't want to live on unemployment money for long.   A particular question concerning the options above: Does being out of academia for a year kill your prospects of obtaining a postdoc position later?  I do have some collaborators who will help me to keep publishing, provided that I put enough work into my research. Also, I'm willing to familiarize myself with other topics on my own (a prerequisite for an academic career anyway).  The next application period will be from October to December 2013, which isn't far away. I'm sure I'll have most of the skills I want by then (and a paper published proving that), but still would have to work until summer 2014 wherever I am applying now.  Please give me honest answers, even if they hurt. I'll provide more information as soon as possible, if anyone has questions. Why is current a scalar quantity? I need to prove that $H$ is a maximal normal subgroup of $G$ if and only if $G/H$ is simple.  My proof to the $(\Rightarrow)$ direction seems too much trivial:  Let us assume there exist $A$ so that $A/H\lhd G/H$. Then by definion, $H$ must be normal in $A$. Because $H$ is maximal, we get $H=A$ and therefore $A/H={1}$  Is it correct?  Update:  Now I see that I need to prove that not only $A\lhd H$ but also $A\lhd G$. Assumig I have proven that, is the proof correct? I've got an MP4 video file and I want to add another AAC audio track to it. I've tried YAMB and MeGUI (frontends for MP4Box) and it plays correctly in Zoom Player, but it picks the wrong track in WMP and plays both at once in Quicktime. I think this might have to do with designating the default audio track somehow.  Does anyone know how to specify the default audio track with YAMB/MeGUI or know of another way of adding a track to an MP4 file? I have seen this a lot but i ran into this question today:    And the answer (while good) has 83 upvotes which seemed a little over the top.  I see dozens of answers of this caliber every week that only seem to get a few upvotes.    Was there some sort of SO policy that encouraged people to upvote more during this period?  Am I just imagining that answers from this period received more votes than comparable ones now?