My friend installed Ubuntu along side windows xp so I could dual boot, after a while I decided to delete the Ubuntu partition unaware that you need the xp recovery disk or something like that to fix windows. So every time I start my computer the grub rescue prompt appearers so is there a way for booting window from grub rescue without the window xp recovery disk?
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.
Recurrence relation for the integral, $ I_n=\int\frac{dx}{(1+x^2)^n} $ Express recurrence relation  of the integral  $$ I_n=\int\frac{dx}{(1+x^2)^n} $$  [My Answer]  $$ I_n = \int\frac{1+x^2}{(1+x^2)^n}dx-\int\frac{x^2}{(1+x^2)^n}dx $$  $$ I_n=I_{n-1}-\int x\cdot\frac{x}{(1+x^2)^n}dx $$  $$ I_n=I_{n-1}-\frac{x}{2(1-n)(x^2+1)^{n-1}}+\frac{1}{2(1-n)}I_{n-1} $$  $$ I_n=\frac{2n-3}{2(n-1)}I_{n-1}+\frac{x}{2(n-1)(x^2+1)^{n-1}} \ \ \ \ (n&gt;1) $$  $$ I_1=\arctan(x) $$  Is my answer correct? Can a dual national visit USA under VWP after visa refusal for other nationality? Recently I was refused an E-2 visa under Section 214b. To be honest I don't really know why because I have strong ties with my home country (house, bank account, family) so my lawyer sent an appeal to the legalnet and I'm  waiting for an answer.  I have a second nationality that I used to travel in USA within the last 15 months under ESTA. A few days after my E-2 refusal I checked my ESTA status  and it is still authorized.  Can I travel to the States right now or not?  I have a purchased business over there and have to take care of my assets. Dimension of cone of projective variety Loading D3.js data from a simple JSON string Is it possible to detect 32 bit vs 64 bit in a bash script? I am writing a bash script to deal with some installations in an automated way... I have the possibility of getting one such program in 32 or 64 bit binary... is it possible to detect the machine architecture from bash so I can select the correct binary?  This will be for Ubuntu machines. I have a shop created with drupal commerece modules,I enabled 2 currency in my shop , but only show one of them, I want to show price in 2 currency       something like this price :  10$  / 20 IRR I use multi currency module to achieve this job, but  I my problem is in payment  phase, I use multi currency module to achieve this job,in multicurrency  module's setting I don't want  use  synchronize method, if you want have two field in my product , one form $ and another for IRR, I did this job by this method     first enable IRR currency in  admin/commerce/config/currency  then in  admin/commerce/config/currency/handling under Enable dedicated price fields for Product check Iranian Rial  by doing this  another field added you my product ( ** Price for IRR** ), this is good , after this I enable  *currency selector * block ,in checking out process by switching the currency I don't see any change in current currency of billing and cart. :( why changing currency not changing cart currency? Whenever I add a Quick Smoke effect, I can't preview it on the viewport unless I bake it.   And Yes, I added the Smoke Domain on the object.   I've seen tutorials like this  and this  that clearly shows the possibility of previewing the smoke before baking it.   I'm using Blender on a Mac with AMD GPU. I would guess that this is something related to OpenGL, as thoroughly explained here -  but that's for Windows.   Does anyone have any idea how to fix this? How to burn or mount an ISO file? When editing a question on , I observed that a link which was not rendered in the post was hyperlinked in the edit preview (see pictures below). I tried reproducing it in the  to see if this also happens when the post is posted for the first time and observed the same. It seems to be a bug after the shift to CommonMark, leading to the different rendering of links on client and server-side. A link following a special character (without any space) is not hyperlinked in the post but is hyperlinked in the preview. A link separated from the special character with a white space appears to have no such problem. (see pictures below and my ). Link not hyperlinked in post  Same link hyperlinked in preview What antivirus programs are available for Ubuntu?  We previously used Symantec Endpoint Protection but it does not work in Ubuntu. I want to change the default placeholder text in my Custom Post Type title field. This isn't possible while registering a new post type.  The following screenshot describes it. This is irritating me. I seen several suggestions (all using different files and syntax) and none of them worked.  How do I set an environment variable for a specific user? I am on debian squeeze. What is the exact syntax I should put in the file to make ABC = "123"? find and echo file names only with pattern found I tried to find this question somewhere else on here, and found a couple that were similar to it -- but all the answers seemed pretty convoluted, and I think it was surprising to me because I just imagined that SQL would have a way easier way to do this.  Essentially, I'm using a GROUP BY to group two values on top of each other. The coding is simple and works well, where I get these results using WITH ROLLUP at the end:  Type    Person  Count Type A  Person 1    10 Type A  Person 2    91 Type A  Person 3    13 Type A  Person 4    10 Type A  Person 5    2 Type A  NULL        126 Type B  Person 6    16 Type B  Person 7    63 Type B  Person 8    15 Type B  Person 9    22 Type B  Person 10   16 Type B  Person 11   3 Type B  Person 12   20 Type B  Person 13   44 Type B  NULL        198 NULL    NULL        360   Is there an easy way to substitute something saying if "NULL" is in the "Person" column, then make NULL AS "Subtotal" and if "NULL" is in the "Type" column, NULL AS "Grand Total?"  And if that's weirdly complicated, I'd be totally fine with just calling all of them "Total."  Thanks! $\lim_{h\to 0}\int \frac{f(x+h)-f(x)}{h}\,\mathrm{d}x = f(b)-f(a)$ Let $f:[a,b]\to  R$ be integrable and continuous on $(a,b)$. Prove that: $$\lim_{h\to 0} \int_a^b\frac{f(x+h)-f(x)}{h} \,\mathrm{d}x = f(b)-f(a).$$  What I've tried so far: make a change of variables, which didn't help. I also thought of using the intermediate value theorem inside the integral, but the function being differentiable is not specified. Any help, tips? Thanks in advance! Evaluating $\int_0^\infty \sin x^2\, dx$ with real methods? Is there any way, shape, or form that ultraviolet light is recorded by a digital sensor?  Ideally, this question is related strictly to the sensor, without even a glass lens in between which could cut or block UV light.  But of course I don't take pictures with a bare sensor, I also have a lens, so I'd also like to know how much UV gets to the sensor to begin with. "If" and "Whether" - Is interrogative IF always replacable by WHETHER? Show bigger amplitude of physical pendulum means bigger period Suppose you have a physical . It is true that as amplitude increases, the period increases. Can we demonstrate this fact without explicitly finding the period (which is pretty involved and pretty messy) in:    an intuitive fashion,  rigorously? How to enable the Edit button in Shutter? I am trying to enable the Edit button in Shutter. I installed the application from Ubuntu Software and are using Ubuntu 18.04.  After taking a screenshot the Edit button is disabled. And when hovering the mouse pointer over the button the text "Goo::Canvas/libgoo-canvas-perl needs to be installed for this feature" is shown.    I have tried to install the package libgoocanvas2-perl and restarted the computer, but the edit button is still not enabled:  sudo apt install libgoocanvas2-perl   That is the only package I can find.  Anyone that knows how to fix this?