I need lock screen and autolocking, but want to never see awful gnome3 lock screen with arrows and clocks. I need just to see gdm login window with password prompt in all cases. How can I completely disable slider with clocks on it?
I need to remove the annoying new "locking" screen that shows a giant clock: I can't remove it with just moving the mouse (as with any other desktop environment), the animation is slow, and it isn't asking me for a password!  I managed to disable it, just to discover that now I can't lock my screen on purpose, so I can't go away from the computer.  Just to clarify, I want to:   After some time the screen could go black, but if I move the mouse or press any key then I can use it directly (like a normal screensaver). If I press super-L then it is locked, and I must type the password to unlock (like a normal lock screen).   I found several "solutions", but none seems to work:
Find the infinite sum $\sum_{k=1}^{\infty}\sqrt k - 2\sqrt {k + 1} + \sqrt {k + 2} $ I am facing a problem, where I have to find the partial sum of a sequence/sum and with that, the infinite sum of the sequence.  $\sum_{k=1}^{\infty}\sqrt k - 2\sqrt {k + 1} + \sqrt {k + 2} $   The problem here is that I don't know how to proceed. I would be thankful if someone would steer me in the right direction. Prove that any complex matrix can be expressed in term of Hermitian and anti-Hermitian matrices How can we prove that any complex matrix can be expressed in term of hermitian and anti-hermitian matrices of the following form $A = H_1 + iH_2$ Where, $H_1$ is hermitian and $H_2$ is an anti-hermitian matrix If $0$ is the zero-object $ \Longrightarrow F(0) $ is the zero object when $F$ additive Let $K$ be a field and $f \in K[x]$ a polynomial of degree $n&gt;0$. Assume that $E$ is an extension of $K$ such that $f$ can be expressed as a product of linear factors over $E$:  $$f(x)=\gamma (x-\alpha_1)(x-\alpha_2)\dots(x-\alpha_n).$$  I want to show that $\lvert K(\alpha_1,\dots,\alpha_2) : K \rvert$ is a divisor of $n!$. I also want to show that if $\lvert K(\alpha_1,\dots,\alpha_n): K \geq (n-1)!$ then $f$ is irreducible over $K$ or $f$ already has a root in $K$.  The problem has a hint. It says: "Use induction on $n=\deg f$. If $f=gh$ in $K[x]$ with $\deg g =r$ and $\deg h=n-r$, then $r!(n-r)!$ is a divisor of $n!$.  Any idea for solving this problem would be appreciated. How can momentum but not energy be conserved in an inelastic collision? In inelastic collisions, kinetic energy changes, so the velocities of the objects also change.  So how is momentum conserved in inelastic collisions? how to replace multiple strings together in Oracle I have a string coming from a table like "can no pay{1},as your payment{2}due on {3}". I want to replace {1} with some value , {2} with some value and {3} with some value .  Is it Possible to replace all 3 in one replace function ? or is there any way I can directly write query and get replaced value ?   I want to replace these strings in Oracle stored procedure the original string is coming from one of my table I am just doing select on that table   and then I want to replace {1},{2},{3} values from that string to the other value that I have from another table How to add programs to the Unity Launcher or Ubuntu Dock? How can I add new programs to the launcher (or the dock in Ubuntu 17.10 and later) in Ubuntu? This is one of the few movies I saw on one of my relative's computer screen when I was little. As I was too young to understand anything, it was approximately 15 to 20 years ago (I believe the movie couldn't have come out after 2000, but the quality of the pictures looked good enough that I have my doubts).   The movie I am looking for was fully animated. Potentially a Japanese animated movie, but I can't tell for sure, as I was too young to tell the difference between Japanese, English or any language. There may be blood in the movie, but I can't tell for sure. However, now that I'm looking back, the drawing style looked slightly Japanese, although it was more of the bloody kind (I could slightly compare its style to "Blood: The Last Vampire" (2000)). Maybe it had an Asian tone to it (e.g. it could be a Korean animated movie too).   One of the "bad guys" was a tall, heavy guy, in a very armoured suit. I can't tell whether he was wearing a suit, or if his body was enhanced because he survived an accident (although I have some form of memory about the latter). Most of his body was covered, but I remember his face not being covered. The most distinctive feature he had was the fact that he had a Minigun where one of his arm should be (a bit like Barret in Final Fantasy 7). I think the first time we see him, he's seen crushing a metallic ashtray with his other hand.   A battle scene in the movie includes the heavy guy having a shoot-out against a relatively thin guy (or should I say "normal-sized man"), fighting him with a machine-gun mounted vehicle (he wasn't the one driving; he was shooting from the back of the vehicle). While they were shooting at each others, I remember the heavy guy screaming (nothing in particular, he was just shouting continuous "AAAHH~!!" in pure rage). The fight didn't seem to happen in a city. It slightly looked like a battlefield. The fight ended with some form of explosion, probably killing off the heavy armoured guy.   The other noticable character was a young boy. He looked... pale, almost weird. His skin was almost green, otherwise he looked like a regular child. He seemed to have some psychic powers too: at some point, when he was feeling uneasy and sweating, a man picked a sample of blood from the back of his neck, using a portable device. But when the man was... either incapacitated or down, that boy broke the device containing his blood simply by looking at it.   At some point near the end of the movie, the pale looking boy and some people (with scientists among them) seemed to be inside a huge facility or underground hangar. There was a lot of space, although I can't remember if it was a factory, or if it was an underground weapon storage. The child was also giving some form of speech too, as all the lights turned on suddenly. The others were possibly surprised by what they were seeing.   One last detail I remember about that child is his smile. While it wasn't as scary as the Joker's, his grin was... kind of creepy, because of how he looked at the others with his small round eyes. He was oftenly grinning.   Overall, most of the scenes I remember were quite dark (mostly because there was little light, or it was night time). The two exception being the battle scene (although it was dark, there was a lot of muzzle fire), and the last underground scene with the boy.   When I asked my relative about the movie, all they could tell me was: "The coloured word 'Aiko' was written on the cover of the CD". Proof a $(2n-1)$-compact manifold I have no idea how prove that $$\{(z_0,\ldots,z_n)\in\mathbb{C}^{n+1} \quad| \quad z_0^d+z_1^2\ldots+z_n^2=0, \quad |z_0|^2+|z_1|^2\ldots+|z_n|^2=2\}$$ is a $(2n-1)$-compact manifold.  How give the charts. For $n=1$ and $d=2$ not distinguish which 1- manifdold is? If a function $f$ is continuous $\implies$ $|f|$ is continuous.(Answered by Myself) $(i)$ Given a function $f:E \rightarrow \mathbb{R}$ define $|f|:E \rightarrow \mathbb{R}$ by $|f|(x)=|f(x)|$ for $x \in E$ show if $f$ is continuous at $c \in E$ then so is $|f|$.        $(ii)$ Now the converse is not true, find $f$ such that $|f|$ is continuous but $f$ is not. Does a card have a keyword if it has the same effect as said keyword? I was looking at  and found the effect surprisingly similar to the keyword Surveil. To compare, first the wording of Contingency Plan and then the wording of the Surveil keyword:       Look at the top five cards of your library. Put any number of them into your graveyard and the rest back on top of your library in any order.     And       701.41a To "surveil N" means to look at the top N cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.     They quite clearly are the same, so can I assume the card states "Surveil 5" instead? And if so, does it trigger abilities which state "Whenever you surveil ..."? Charge controller for Li-ion or Li-Polymer battery I am trying to work out the good charger for Mobile phones, which can serve as good performer for various smart phones out there in market these days &amp; mostly using Li-ion battery. Charging has 4 stages -- "the initial trickle-charging, then constant current charging, then constant voltage charging &amp; finaly Top-up charge" -- all this is controlled &amp; monitored by a control circuit/IC of charger. So, my concern is if such circuit/module/IC is already there in Mobile phones &amp; taking care of all protections to battery/phone including overheating during charge OR The charger designer have to incorporate these circuits in Charger itself? If former case, that means we just need to make a charging source giving ample current &amp; 4.75V-5.25V voltage, like a high-powered USB output port would gives. My feeling is such stages-wise charging &amp; control/monitor circuitry is already within the phone set, i just want to reconfirm. Is it "5–6 weeks are a lot of time" or "5–6 weeks is a lot of time"? I was just copyediting  and my native English speaker Sprachgefühl told me I had to correct the grammar of one sentence:     ... 5–6 weeks are a lot of time ...   by changing the are to is. But as I was doing so I started wondering why is it that in this case it seems that I have to make the verb disagree with the plural subject?  So is my feeling for English going bad or if I did the right thing, how could I explain this to somebody who's learning English for instance? 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 (—)? What is the meaning of “runneth” in ? Label legend interval with number of elements in ArcMap? I have made a series of  in ArcMap 10. When I classify the interval the bottom of the dialogue tells how many elements are in the class.  Is it possible to have this number automatically places beside my class labels? Creating random numbers with no duplicates Why does String.split need pipe delimiter to be escaped? NIST randomness test p values I have a binary sequence of length $2^{20}$. I am using the NIST statistical test, assess.   What should be taken for ./assess and  How many bitstreams? in this test? In the final Analysis report, what p-values should be there to pass this test? How to fix Permission Denied (Public key) error? While trying to communicate between my desktop Ubuntu 12.10 and Fedora 19 desktop, I am facing the error of Permission Denied (Public key). I am able to login through ssh from fedora to Ubuntu, but not vice-versa. I even performed telnet on both machines via port 22 and both machines are listening, but not through ssh. What to do? Any idea?  My sshd_config file is as follows:  # Package generated configuration file # See the sshd_config(5) manpage for details  # What ports, IPs and protocols we listen for Port 22 # Use these options to restrict which interfaces/protocols sshd will bind to #ListenAddress :: #ListenAddress 0.0.0.0 Protocol 2 # HostKeys for protocol version 2 HostKey /etc/ssh/ssh_host_rsa_key HostKey /etc/ssh/ssh_host_dsa_key HostKey /etc/ssh/ssh_host_ecdsa_key #Privilege Separation is turned on for security UsePrivilegeSeparation yes  # Lifetime and size of ephemeral version 1 server key KeyRegenerationInterval 3600 ServerKeyBits 768  # Logging SyslogFacility AUTH LogLevel INFO  # Authentication: LoginGraceTime 120 PermitRootLogin yes StrictModes yes  RSAAuthentication yes PubkeyAuthentication yes #AuthorizedKeysFile    %h/.ssh/authorized_keys  # Don't read the user's ~/.rhosts and ~/.shosts files IgnoreRhosts yes # For this to work you will also need host keys in /etc/ssh_known_hosts RhostsRSAAuthentication no # similar for protocol version 2 HostbasedAuthentication no # Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication #IgnoreUserKnownHosts yes  # To enable empty passwords, change to yes (NOT RECOMMENDED) PermitEmptyPasswords no  # Change to yes to enable challenge-response passwords (beware issues with # some PAM modules and threads) ChallengeResponseAuthentication no  # Change to no to disable tunnelled clear text passwords PasswordAuthentication yes  # Kerberos options #KerberosAuthentication no #KerberosGetAFSToken no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes  # GSSAPI options GSSAPIAuthentication no GSSAPICleanupCredentials yes  X11Forwarding yes X11DisplayOffset 10 PrintMotd no PrintLastLog yes TCPKeepAlive yes #UseLogin no  #MaxStartups 10:30:60 #Banner /etc/issue.net  # Allow client to pass locale environment variables AcceptEnv LANG LC_*  Subsystem sftp /usr/lib/openssh/sftp-server  # Set this to 'yes' to enable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication and # PasswordAuthentication.  Depending on your PAM configuration, # PAM authentication via ChallengeResponseAuthentication may bypass # the setting of "PermitRootLogin without-password". # If you just want the PAM account and session checks to run without # PAM authentication, then enable this but set PasswordAuthentication # and ChallengeResponseAuthentication to 'no'. UsePAM yes   This is sshd_config of ubuntu system.