I've noticed several posts about this same topic, but found no reasonable solution.  post suggests deleting the files, but I want to avoid that since I'm using  and that same post says that it will break apache. I ran  sudo du -h --max-depth=1   this is the result I get  du: cannot access './run/user/1000/gvfs': Permission denied du: cannot access './run/user/121/gvfs': Permission denied 2.3M    ./run du: cannot access './tmp/.mount_jetbraP4UBzE': Permission denied 104K    ./tmp 6.5M    ./libx32 16K ./lost+found 15M ./sbin 5.7G    ./usr 4.0K    ./cdrom 16M ./etc 0   ./sys 0   ./dev 618G    ./var 13M ./bin 4.0K    ./lib64 195G    ./home 4.0K    ./srv 5.8M    ./lib32 936K    ./root 277M    ./boot 1.2G    ./lib du: cannot read directory './proc/2824/task/2824/net': Invalid argument du: cannot read directory './proc/2824/net': Invalid argument du: cannot read directory './proc/2825/task/2825/net': Invalid argument du: cannot read directory './proc/2825/net': Invalid argument du: cannot access './proc/5070/task/5070/fd/4': No such file or directory du: cannot access './proc/5070/task/5070/fdinfo/4': No such file or directory du: cannot access './proc/5070/fd/3': No such file or directory du: cannot access './proc/5070/fdinfo/3': No such file or directory 0   ./proc 7.3G    ./snap 14G ./opt 7.1T    ./media 4.0K    ./mnt 7.9T    .   so then I went to /var and  /var$ sudo du -h --max-depth=1 142M    ./cache 60K ./tmp 2.3G    ./www 92K ./spool 6.4M    ./backups 4.0K    ./crash 4.0K    ./mail 4.0K    ./metrics 612G    ./log 3.2G    ./lib 4.0K    ./local 228K    ./snap 4.0K    ./opt 617G    .   so than I tried /var/log  /var/log$ sudo du -h --max-depth=1 208K    ./apt 68K ./cups 24K ./samba 4.0G    ./journal 40K ./mysql 8.0K    ./hp 4.0K    ./gdm3 506M    ./nordvpn 4.0K    ./dist-upgrade 20K ./libvirt 92K ./apache2 28K ./unattended-upgrades 2.7M    ./installer 4.0K    ./speech-dispatcher 612G    .   edit: by request here it is  /var/log$ sudo du -xh -d 3 /var/ | sort -h -r | egrep -v '*K|*M' 617G    /var/ 612G    /var/log 4.0G    /var/log/journal/1e5573225229470a9199ad4e005b6533 4.0G    /var/log/journal 3.2G    /var/lib 2.5G    /var/lib/snapd 2.3G    /var/www 2.2G    /var/www/pixel 1.3G    /var/lib/snapd/snaps   Now I'm stuck. I have the same problem when I open Disk Usage Analyzer.     How can I free up space on the system? Is this a false positive? In other words it seems like it's reading the free space as used space. Is this a bug?
The disk that contains Ubuntu on my computer is 115GB in size.  When the disk was 114.7GBfull.  I started deleting some files here and there to free up around 5GB.  But I noticed the disk was 114GB filled again. I thought it was some cache or swap thingy so didn't give it much thought and went ahead and freed around 40GBby shifting some media files out of the disk.  I have a notification in an hour or so that the disk is full yet again!! 40GB!!! All gone!  So I debugged the problem down to the /var/log/syslog file which was initially definitely less than 20GB. I know this because /var folder was 17GB before I cleared the memory.  /var/log/syslog file is currently 55.9GB!  Could someone be so gracious to explain this anomaly? Is this a bug? Or am I affected with some malware or virus?
Making an invisible pressure plate I'm trying to build a teleporter. I want the player to be teleported from the first sign(left) to the right sign(right). So, when the player steps on the red wool on the left, he will automatically be teleported to the red wool on the right. I do not want to use any pressure plats.It might work with the testfor comment, but I didn't figure out, put that only works with a radius. BTW I'm in 1.10.2 bou I could probably change the version if necessary.     The testfor command block should activate the teleport command block,when the player is detected. Now, I'm not really the expert, so I know non of the commands that you would need to build this construction. Please help, I would highly appreciate it! If you need any more details, ask me! I have downloaded the offline (consumer, i.e. not msi package) installer for Google Chrome. But when I run it, it tries to contact a Google server to check for a newer version. If it finds it, it will download that first, and then install that version. It doesn't use the version that is already there, as part of the EXE file. For me, that defeats the point of having an offline installer. I keep a repository of all the free and purchased software locally, so that I can install them quickly whenever I need to. But as more and more people get access to broadband Internet connections, many developers and companies are pushing for offline installers with new releases. Many software titles, like Google Chrome, are almost exclusively distributed with online installers.  File name: ChromeStandaloneSetup.exe File version: 1.3.21.115 Size: 36.6 MB (38 416 368 bytes) SHA-1: 2393BAB7F408DC8D30F039FCA5D6B45600A0C4E7   How do I install Chrome as is, without automatically checking for and getting a newer version?  Will  work with Chrome installer? Is there a switch to disable version check when running the installer?  Update:  The "duplicate" question linked to below points out File Hippo as a possible repository where you one can get previous versions of Chrome. They do have a healthy listing of pretty much every single Chrome version ever released on Windows, both beta, dev and stable versions. Unfortunately they don't host the installer files, they only redirect to Google servers for downloads, which only spits out the installers for the latest versions of Chrome. It's not just File Hippo, I also tried downloading an older version of Chrome from CNET Downloads, and they too just redirect you to Google servers for download.  For whatever the reason (security related probably), Google doesn't like anyone to install an older version of Chrome on any system. Apparently not even your common source for downloading an older version of a software, like the CNET Downloads, not even they are allowed to host the Chrome installer files on their own servers. The redirects to Google is probably dictated by Google.     Google is a dictator!   They don't even allow full standalone offline installers to be installed as is, without checking for newer version. I tried running the installer from cmd with some of the command line switches used for Chromium. I only ended up with errors.    The business oriented msi installer (GoogleChromeStandaloneEnterprise.msi) might have some additional command line options you can use, but I wouldn't know if there is one that disables the check for a newer version. I have yet to find a complete list of switches you can use. The only one I've found so far is /update but that only does the opposite thing. So I'll give up here and go back to the trusty Firefox. Via command line, I have a log file I'd like to keep track of.  What I want is to have, basically, a tail that refreshes when the log is updated making the text scroll upwards as new lines are appended to the log file.  Is there anything out there that does that without having to write some code? Find an example of a function sum $\sum_{n=1}^\infty u_n $ that converges   uniformly on $[a,b]$ and converges absolutely pointwise, but   $\sum_{n=1}^\infty |u_n| $ doesn't converge uniformly on $[a,b]$.   This seems pretty straightfoawrd but it's really hard to find an example. The choice of $u_n$ must be very specific. You can actually prove any power series wont work (due to Abel's theorem)  In addition, in order to prove the uniform convergence, $u_n$ must not satisfy Weierstrass' M-Test (because then $\sum |u_n|$ would converge uniformly aswell) I am having a hard time with the following real analysis qual problem.  Any help would be awesome.  Suppose that $f \in L^p(\mathbb{R})$, where $1\leq p&lt; + \infty$. Let $T_r(f)(t)=f(t−r)$. Show that $\lim_{r \to 0} \|T_rf−f\|_{L_p} =0$, that is $$ \lim_{r\to 0} \left( \int_{\mathbb R} |f(t-r) - f(t)|^p \mathrm d t\right)^{1/p} =0.$$ I was wondering if anybody knew a command that would allow me to open a Nautilus (if that's the right name for the Ubuntu graphic/window explorer) window from the command line at the current directory that the user is at.  So, if I open a command line, and type:  cd /home/myUser/some/long/path/to/a/directory   Then, I'd like to be able to issue some command:  nautilus open-sesame   And have a graphic window opened to /home/myUser/some/long/path/to/a/directory. Is this even possible? What makes a field not groupable I'm trying to use an aggregate query, but one of the fields I want to group by is not groupable (saw it in the soql error and then verified groupable=false in the metadata).  It's just a number field that holds an integer (number 2,0 in salesforce field spec-speak).  Is there a trick to make it groupable?  Any way around this problem? I don't want to write hundreds of lines of code just to average a list by this field. When using Alt+Tab, I can't seem to get back to Skyrim. When clicking its icon or Alt+Tab to get back, I just see an empty window. Windowed mode doesn't allow me to use it in a Windowed (Fullscreen) manner as seen with other games, so that doesn't seem to be an option either. Is there any way to fix this behavior? Homomorphism between compact Hausdorff spaces. How to import a .max model into Blender? I've tried to import but I don't see the (.max) file as an option when importing. Is there another way to import the 3DMax model into Blender for rigging and animation? So I am asked to find all the isomorphisms between $G = (\mathbb Z_4,+)$ and $H = (U_5,*)$.  I solved it as follows: we will have two isomorphism corresponding to the two generators of $U_5$.  The first isomorphism : $\phi([x]_4)$ = $[2]_5^x$   The second isomorphism is: $\phi([x]_4)$ = $[3]_5^x$   Notice that [2] and [3] are the only generators of $U_5$ one can check it systematically or use the fact that $a^m$ is a generator iff gcd(m,4) = 1.  So I just wanted a verification of my work I showed that they are bijective, well defined, and is a homomorphism. Center figure that is wider than \textwidth Can't connect to wireless 13.10 I have ubuntu installed as the sole OS on a T420. Before this I had installed the #! distro (and Xubuntu before that) and wireless worked seamlessly on either. My home hotspot shows up but when I click on it tries for a while before disconnecting.  Before going into the problem further, I wanted to double check that I entered the wifi password for my home network correctly. I went to Edit Connections >> Wi-Fi Security and changed the key, but it is still not able to connect. So I think the password is definitely correct. I don't understand why it can't connect now. A problem about an $R$-module that is both injective and projective. Let $R$ be a domain that is not a field, and let $M$ be an $R$-module that is both injective and projective. Prove that $M= \left \{ 0 \right \}$.   This is exercise 7.52 of Rotman's Advanced Modern Algebra. Using theorems before exercises, because $M$ is injective and $R$ is a domain, I conclude that $$\forall m\in M ,\forall r\in R\ (r\neq 0) ,\exists {m}'\in M \Rightarrow m=r{m}'$$ and also because $M$ is projective there is a surjective $\psi$ from free $R$-module $F$ with basis $\left \{ e_{i} \right \}_{i\in I}$ to $M$ and thus we can conclude that for every $m\in M$ we have $$m=\sum r_{i}\Psi (e_{i})$$ now I don't know how should I use these together.  The idea of what is happening or a suggestion or a hint will be great. How do I install ndiswrapper support for an unsupported RTL8723DE wireless module? A man enters a comatose author's dreams to wake him up This is a short story, I think, but I might be wrong.  A man is recruited to enter an authors' dreams to try &amp; bring him out of a coma &amp; finds himself in a hackneyed barsoom type world where the coma victim is a muscle bound hero, it's a desert world with two suns, the damsel in distress is the typical scantily clad princess trope.  The "hero" basically spoils the authors' dreams by manifesting a pistol &amp; simply shooting the monsters dead at one point &amp; the author tries to write him out of the "story" by simply jumping forward several chapters &amp; is both surprised &amp; peeved to find him still there.  The author eventually comes out of his coma &amp; immediately assaults the man when he recognizes him from his dreams, he tries to strangle him if I remember right.  He enters the authors' dreams with some kind of experimental dream imaging tech, basically a two ECG sort of set up linked through a computer with him put to sleep with drugs I think. Possible Duplicate:          How to download a Youtube video from command line?  Mac OS X and/or Ubuntu Linux. Optionally, i'd like to save it in .avi or .mkv format. "The queen of England's crown" or "The queen's of England crown"? Possible Duplicate:          What is the correct way of these two sentences?   The queen of England's crown The queen's of England crown   Strictly linguistically, sentence 2 should be the correct one, since the crown belongs to the queen and not to England but it sounds really awkward to pronounce. print python stack trace without exception being raised In a complete metric space with no isolated points, any countable intersection of open dense sets is uncountable?