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No updates since a long time Using Ubuntu, I have a habit of running: sudo apt update sudo apt upgrade   on every startup. But for a month, I guess, there have been no updates whatsoever. The message shows: All packages are up to date  Now I am starting to worry. Can there be a fault in my update manager? As far as I know, I've made no changes to the package manager settings. But no updates for almost a month seems kind of weird. Any feedback would be helpful. Thanks. Questions on the legal protection of games and their parts (assets, sounds, title) we started new pirate game, and I just want to ask some questions about rights. So I am new in game dev, I guess there are a lot of answers, but I guess professionals can advise something for first steps.  So we started some things like:   concept arts sounds we are working on the name of the game (just use temp one for now) we develop some models of ships and characters   I have question what's my step to protect everything I listed above. Do I need to protect everything separately? Do I need to register a game somewhere? Can I use my already made domain and subdomain for the game? Or do I need to register unique one domaine. Add time restriction in ArcGIS Network Analyst Would the One Ring have stayed hidden if Bilbo hadn't turned up? More informative flagging history for comments How do I boot to a command line interface instead of a GUI? Hi I have ubuntu server 10.04 installed and I also installed the following:  su aptitude install xorg xfce4 aptitude install &lt;name of GUI browser, I use firefox&gt; aptitude install gedit aptitude install gnome-terminal   Now when I restart the system it goes to the GUI login, what I am really after is a system that loads the CLI by default and then I can use startx to load the GUI when really necessary. I am trying to learn CLI but I would like to retain access to the GUI for now. And, how can I switch between CLI and GUI anytime? When I play Black Ops 2, it seems that my xbox controller is inverted. Example: if I press up, my character looks down and vice versa. It was not like this before. Does anyone know how to reset the controller back to its original settings? How to mount electronics on a vehicle chassis safely I want to implement a control system I designed for a light electric motorbike. I would like to mount it as professionally as possible on the chassis. It consists of a power system pcb and a SAMC21 development board which I'll merge later once this all works properly. I have tried screwing it directly on the aluminium chassis but have found that shocks and vibrations from the horn disturbed the system or even destroyed it upon large shocks like a few hammer hits. Is there a specific way car and motorcycle manufacturers mount their electronics to make their system as robust as possible? Thank you for your help! Difference between pre-increment and post-increment in a loop? Is there a difference in ++i and i++ in a for loop? Is it simply a syntax thing? PrintWriter append method not appending Every package "has no installation candidate" While attempting to install openssh-server on Ubuntu 14.04 64-bit, I get the following error:  Package openssh-server is not available but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source  E: Package 'openssh-server' has no installation candidate   I see the same error when trying to install any package.  This is the sources.list file:  deb http://archive.canonical.com/ubuntu hardy partner deb-src http://archive.canonical.com/ubuntu hardy partner I'm currently working my way through Harvard's online abstract algebra lectures (if you're interested, you can find them ).  The lectures come complete with notes and homework problems.  Of course, since I don't actually go to Harvard, I can't hand in the homework assignments to find out if I'm doing them correctly.  So I've decided to try to crowd source the grading of my solutions.  I'll post individual questions as I finish them and wait for comments.  I would like to get critiques of not just my reasoning but the style of my write ups as well.  Also, any alternative approaches to the problem would be welcome.  I've looked for forums dedicated to these kinds of OCW courses but have not been able to find any.  This surprises me.  It seems like, with the advent of these free online educational resources, an online meeting place for those who take advantage of them would be a natural offshoot.  So this might be a bit of an experiment.  Unless I'm the 873rd person to post something like this here.  If that's the case, sorry for being so long winded.  Anyway, on with the question.  This one is assigned in the 4th lecture.     Let $V$ denote the Klein 4-group.  Show that $\operatorname{Aut}(V)$ is isomorphic to $S_3$.   (I've moved my solution below to keep this question from showing up in the unanswered list.)  Thanks... I'm looking for mathematics books, courses + exercises for high school level. My daughter was high school certificated but she has stopped her studies for 5 years. She would like to be involved in new educational program but she needs to restore her mathematic capabilities.  Could you help me to identify which mathematics books can help her?  Thanks a lot for your reply,  FR. When should "into" be used rather than "in to," and vice versa? "Into" (one word) and "in to" (two words) are frequently confused.  In what situations should the former be used?  The latter? Dell R730xd - Best way to configure storage for simultaneous use with ZFS & Hardware RAID I recently purchased a Dell R730xd that came with an H730 RAID card. I would like to bring an existing 6 disk ZFS pool to this server as well as create an additional 6 disk hardware RAID.   Is it possible to configure an H730 RAID card to operate in both HBA and RAID mode simultaneously? And then only manage 6 of the disks in a hardware RAID and allow the OS to manage the remaining 6 disks in a software RAID?  If not, can a Dell R730xd use both an H730 RAID card and an LSI 9207-8i HBA card simultaneously? Would you simply plug one SAS cable from each card into each part of the Backplane? Will I need to purchase any new cables to connect the LSI 9207-8i to the backplane in my R730xd?  Is there a better card to use for ZFS in an R730xd using spinning disks than the LSI 9207-8i? How do I post text so that it is formatted as code?  What do I need to do so that my code shows up properly &mdash; not escaped or removed &mdash; when posted? And how to get the correct syntax highlighting?     For more information, see "" in the . Difference between Unity and GNOME I often come across the terms Unity and GNOME while reading about Ubuntu. I understand that Unity is the default desktop environment for Ubuntu. What is GNOME and how is it related to/different from Unity? Birthday line to get ticket in a unique setup At a movie theater, the whimsical manager announces that a free ticket will be given to the first person in line whose birthday is the same as someone in line who has already bought a ticket.  You have the option of choosing any position in the line. Assuming that you don't know anyone else's birthday, and that birthdays are uniformly distributed throughout the year (365 days year), what position in line gives you the best chance of getting free ticket? Am I Running as a Service I am having issues with input in VMware Workstation Player 12 in windowed mode or on multiple screens. When typing something in the VM and moving mouse cursor out of the VM without clicking on anything (for example on the second screen with host OS), the typing in that VM stops until I move the cursor back into VM.  Can this feature be disabled somehow so I am able to type in the virtual machine even when cursor is outside of it?  Both guest and host are Win10 x64 OS.