I was trying to reset the password and I held down the shift key when booting didn't where I wanted to go instead it said error attempting to read or write outside disc 'hd0' entering rescue mode.... grub rescue>
I tried to install Xubuntu 13.10 on an older computer. I noticed some difficulties during installation that may be relevant to my problems. Notably:   The screen resolution was extremely low. The windows were much larger than the screen and I had to move them around to get to the "Next" button. The mouse cursor was a blur of colours that was flashing all the time.   The installation finished and I tried to reboot the computer. Immediately I got:  error: attempt to read or write outside of disk 'hd0'.  Entering rescue mode...  grub rescue&gt;   I made a  USB disk, booted it and chose the default repair. The application told me that the problem is repaired and that If this does not solve my problem I should show  to someone who can help me.  What should I do next? I already tried to install Ubuntu and Xubuntu, both with no success.  EDIT:  I found a workaround.   Insert the Xubuntu live USB Select "try Xubuntu" In the settings menu select "install Xubuntu"   This fixed the problem for me. Since it is solved I cannot test the answer.
Using `M` instead of `k` when rep is >= 1M on https://chat.stackexchange.com/users I read on  ()    Shouldn't it be 1.03m or (if we really follow the conventions of the metric system) 1.03M instead? How does Newtonian mechanics explain why orbiting objects do not fall to the object they are orbiting? I am aware of the die() command in PHP which exits a script early.  How can I do this in Python? How to zoom in/out an UIImage object when user pinches screen? xslt processing on select attribute on apply-templates Black hole "no hair" theorem The  (or conjecture), suggests that black holes can be entirely described by their mass, angular momentum and charge. All other details of the BH formation are lost.  Is there a simple way of understanding why you would be able to tell the difference between a BH made from protons and one made from electrons, but not between one made from matter rather than anti-matter?  i.e. What is special about charge, and why aren't lepton number, baryon number, strangeness etc, also black hole properties? How do I resolve this installation error? I am getting the following error while installing Drush with composer require drush/drush.     Using version ^8.1 for drush/drush   ./composer.json has been updated   Loading composer repositories with package information   Updating dependencies (including require-dev)   Your requirements could not be resolved to an installable set of packages.            Problem 1   - drush/drush 8.1.0 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.1 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.2 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.3 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.4 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.5 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.6 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.7 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.8 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - drush/drush 8.1.9 conflicts with drupal/drupal [No version set (parsed as 1.0.0)].   - Conclusion: don't install drush/drush 8.1.12   - Conclusion: don't install drush/drush 8.1.11   - Conclusion: don't install drush/drush 8.1.10   - Conclusion: don't install drush/drush 8.x-dev   - Installation request for drupal/drupal [No version set (parsed as 1.0.0)] -> satisfiable by drupal/drupal [No version set (parsed as 1.0.0)].   - Conclusion: remove phpdocumentor/reflection-docblock 3.1.1   - Installation request for drush/drush ^8.1 -> satisfiable by drush/drush [8.1.0, 8.1.1, 8.1.10, 8.1.11, 8.1.12, 8.1.2, 8.1.3,   8.1.4, 8.1.5, 8.1.6, 8.1.7, 8.1.8, 8.1.9, 8.8.x-dev, 8.x-dev].   - Conclusion: don't install phpdocumentor/reflection-docblock 3.1.1   - drush/drush 8.8.x-dev requires phpdocumentor/reflection-docblock ^2.0 -> satisfiable by phpdocumentor/reflection-docblock [2.0.0,   2.0.0a1, 2.0.0a2, 2.0.0a3, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.0, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.0a1, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.0a2, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.0a3, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.1, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.2, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.3, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.4, 3.1.1].   - Can only install one of: phpdocumentor/reflection-docblock [2.0.5, 3.1.1].   - Installation request for phpdocumentor/reflection-docblock (locked at 3.1.1) -> satisfiable by phpdocumentor/reflection-docblock [3.1.1].      Installation failed, reverting ./composer.json to its original   content. Has user testing found that the "three horizontal bars" for main menu on mobile is commonly understood? Remove Sender name ( not email address) from outgoing Mac Mail Can a fired moderator be elected as a moderator? While this question is inspired by recent events, it is an independent question and not tied down to any specific moderator or situation.  There's precedent for a moderator who resigned their diamond to simply ask Stack Exchange for their diamond back, without having to stand for reelection. Obviously, this may not apply if the moderator did not resign, but was removed for cause by Stack Exchange.  If a moderator has been "fired" by Stack Exchange (has had their diamond removed involuntarily by corporate action), is the person eligible to pull a  and regain a diamond through the democratic process on one of our sites, or would any such attempt be blocked? I'm aware that there is a restriction on  from standing for election, but this is not the same thing as being stripped of a diamond (fired moderators, IME, aren't also given a full site suspension unless their behavior goes beyond "possibly not a very good moderator" into "supervillain" territory).  If there is no particular rule, what should that rule be?   Should fired moderators be immediately eligible to stand for election, subject only to community approval of them returning? Should fired moderators have to go through a separate re-vetting process with Stack Exchange to regain eligibility to stand for office? Should fired moderators have an ineligibility window in a similar way that suspended users have one (e.g. after X months or years after being fired, they may stand for election). Should fired moderators be forever banned from election?   In no way am I asking about the process for a fired moderator to seek restoration through corporate appeals, etc. I'm asking only about the community election process - if a site's community wants to elect a previously fired moderator, is this inherently objectionable to Stack Exchange? Presheaf which is not a sheaf -- holomorphic functions which admit a holomorphic square root I'm thinking about a problem in Ravi Vakil's algebraic geometry notes  (Exercise 3.2B) and I'm having trouble with the second part of the exercise as my understanding of complex analysis is quite rudimentary.   If to every open set $U\subset \mathbb{C}$ we associate the ring of holomorphic functions which admit a holomorphic square root, this defines a presheaf on $\mathbb{C}$ (I can see this).   Apparently however this is not a sheaf -- supposedly it fails to satisfy the gluing property.   To prove this, we need to take an open cover $\{U_i\}$ of some open $U\subseteq \mathbb{C}$, a holomorphic function $f_i:U_i\to \mathbb{C}$ for each $i$ which has a holomorphic square root (i.e. there exists a holomorphic function $g_i$ for each $i$ such that $f_i(z)=g_i(z)^2$ for all $z\in U_i$), which all agree nicely on the intersections of the various open sets, but such that it is impossible to find a holomorphic function $f:U\to \mathbb{C}$ with a holomorphic function which restricts to $f_i$ on each $U_i$.   Any help would be great -- my problem is in showing that such a function cannot exist. I'm trying to prove : Given a simple graph $G$ with $n$ vertices, where $n$ is even, prove that if every vertex has degree $\dfrac n2 + 1$, then $G$ must contain a (simple) $3$-cycle. A (simple) $3$-cycle is a set of $3$ (distinct) vertices, $a, b, c$ such that $ab$ is an edge, $bc$ is an edge and $ac$ is an edge.  I know there are similar ones already on here, but I can't comprehend any of the answers. This is what I have so far:  Base Case: Since the graph has to have at least $3$ vertices to have a simple $3$-cycle, the lowest possible even number of vertices is $n = 4$.   $\dfrac42 + 1 = 3$ degree (edges attached to node). This means each vertex connects to each of the other $3$ vertices since $G$ is a simple graph. Thus, any combination of $3$ vertices will be a simple $3$-cycle.  Inductive Hypothesis: Assume a simple graph with $k$ vertices, where $k$ is even, contains a simple $3$-cycle if each vertex has degree $\dfrac k2 + 1$.  Inductive Step: Since only concerned about when the graph has an even number of vertices, going to show a simple graph with $k + 2$ vertices, where $k$ is even, contains a simple $3$-cycle if every vertex has degree $\dfrac{k+2}{2} + 1$   This is as far as I get and don't know how to finish the Inductive Step (Also please feel free to let me know if I messed anything up, up to this point) What is mirror lockup and what is its primary function? My SLR is equipped with the mirror lockup function. What does it do, and when would I employ such a feature? Is there a difference between Therefor and Therefore? ETS() function, how to avoid forecast not in line with historical data? Performance difference between dot notation versus method call in Objective-C You can use a standard dot notation or a method call in Objective-C to access a property of an object in Objective-C.  myObject.property = YES;   or  [myObject setProperty:YES];   Is there a difference in performance (in terms of accessing the property)? Is it just a matter of preference in terms of coding style? How many stickers do I need to complete my FIFA Panini album? I'm playing the , which is an Internet adaption of the classic Panini albums that are usually published for the soccer world cup, European championship, and possibly other tournaments.  The album has placeholders for 424 different stickers. The purpose of the game is to collect all 424. The stickers come in packs of 5, which can be obtained through codes found online (or, in case of the classic printed album, bought at your local newsstand).  I make the following assumptions:   All stickers are published in the same quantity.  One pack of stickers does not contain duplicates.     How can I find out how many packs of stickers I need to acquire in order to be reasonably sure (let's say 90%) that I have all 424 unique stickers? Transit visa at Istanbul Airport, Turkey, during a Turkish Airlines arranged stopover? Do I need a transit visa at Istanbul Airport to enter Istanbul for city sightseeing or hotel accommodation?. All services provided free by the Turkish Airline. I am Nigerian citizen and booked Turkish Airline flight to Nigeria with 12hours layover at Istanbul Airport. A phonon is a quantized unit of sound; they are encountered when quantizing lattice vibrations in solids. Now, even an ideal gas supports sound waves, but in this case, interactions between atoms are weak. That makes it hard to imagine what a quantized vibration would look like, since at small scales, the particles are free!   Is there a phonon picture for sound in an ideal gas? Is it ever useful? How can a path animation be used as an action in the game engine? I animated a rollercoaster using a Bezier Curve and a Follow Path Constraint affecting the vehicle.  Then I tried to use the automatically created action in the game engine but the Action Actuator has no effect .    How can this action be used in the BGE? Can the Path Animation alternatively be converted into keyframes?