I have no problem with wired connection, but wifi is not even an option on my newly installed xubuntu 15.04. I found similar question (Wifi not detected Xubuntu 13.10) and run the commands in terminal, here is the output:  op@op:~$ lspci -knn | grep Net -A2 06:02.0 Network controller [0280]: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller [14e4:4318] (rev 02)     Subsystem: Hewlett-Packard Company Broadcom 802.11b/g WLAN [103c:1355]     Kernel driver in use: wl op@op:~$ lsmod | grep -e wl -e b43 wl                   6152192  1  cfg80211              462848  1 wl   This is what I have after running it again:  op@op:~$ lsmod | grep -e wl -e b43 b43                   401408  0  bcma                   49152  1 b43 mac80211              626688  1 b43 cfg80211              462848  2 b43,mac80211 ssb                    57344  1 b43  op@op:~$ sudo apt-get remove --purge bcmwl-kernel-source [sudo] password for op:  Reading package lists... Done Building dependency tree        Reading state information... Done Package 'bcmwl-kernel-source' is not installed, so not removed  op@op:~$ sudo apt-get install linux-firmware-nonfree Reading package lists... Done Building dependency tree        Reading state information... Done linux-firmware-nonfree is already the newest version. The following packages were automatically installed and are no longer required:   dkms linux-headers-generic linux-image-generic thermald Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.  No files to remove, no files to install and still no wifi.   Any ideas???  Here is what I tried and collected as much info as I could. Please look: Uninstalled all wifi drivers from the system:  sudo apt-get remove --purge bcmwl-kernel-source sudo apt-get remove --purge linux-firmware-nonfree sudo app-get autoremove   Restart. Restart hangs forever. Power Down. PC comes back up with “System program problem detected” Installing linux-firmware-nonfree  sudo apt-get install linux-firmware-nonfree Looks good so far:  Preparing to unpack .../linux-firmware-nonfree_1.16_all.deb ... Unpacking linux-firmware-nonfree (1.16) ... Setting up linux-firmware-nonfree (1.16) ... op@op:~$    Unplug Ethernet cable and restart. no wifi please see screenshot:  Plug Ethernet cable back removing linux-firmware-nonfree installing bcmwl-kernel-source and it hangs after installing no prompt available system is workable just terminal hanging. Please see bellow: Loading new bcmwl-6.30.223.248+bdcom DKMS files... First Installation: checking all kernels... Building only for 3.19.0-28-generic Building for architecture i686 Building initial module for 3.19.0-28-generic Done.  wl: Running module version sanity check.  - Original module    - No original module exists within this kernel  - Installation    - Installing to /lib/modules/3.19.0-28-generic/updates/dkms/  depmod....  DKMS: install completed.  NO PROMPT! RESTARTING. Hangs on the Xubuntu logo, Doesn’t restart. Power down. Comes back same story. No wifi. Since this was not an issue in Xubuntu 14 should I downgrade?
I'm having serious problems installing the Broadcom drivers for Ubuntu. It worked perfectly on my previous version, but now, it is impossible.   What are the steps to install Broadcom wireless drivers for a BCM43xx card?  I'm a user with no advance knowledge in Linux, so I would need clear explanations on how to make, compile, etc.    lspci -vnn | grep Network showed:   Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller [14e4:432b]      iwconfig showed:  lo        no wireless extensions. eth0      no wireless extensions.   NOTE: Answer below is updated every time new information is added and confirmed working.
country code TLD vs second level ccTLD I'm really worried about professionalism.  My site would be something like http://mywebsite.uy instead of http://mywebsite.com.uy.  What do you think about this practice? What should I have in mind at the moment of choosing one? Salesforce, Oracle and the Seven Dwarfs Over my time as a Salesforce developer, I've written some code which on occasion managed to surface Oracle plsql exceptions and curiously the error text contains the name of one of Disney's .  I've teased out Doc, Grumpy, Happy, Bashful and Sneezy. I'm sure the other two are not far away.   What is the underlying "thing" on the database platform that is named after a Dwarf? Why were these named after Dwarves?      java.sql.SQLException: ORA-30006: resource busy; acquire with WAIT   timeout expiredORA-06512: at "DOC.CAPEX", line 2200ORA-06512: at line   1: SQLException while executing plsql statement: {call   cApex.update_sysmodstamp(?)}([       java.sql.SQLException: ORA-30006: resource busy; acquire with WAIT   timeout expiredORA-06512: at "GRUMPY.CAPEX", line 2563ORA-06512: at   line 1: SQLException while executing plsql statement: {call   cApex.update_sysmodstamp(?)}([       java.sql.SQLException: ORA-30006: resource busy; acquire with WAIT   timeout expiredORA-06512: at "HAPPY.CAPEX", line 2715ORA-06512: at   line 1: SQLException while executing plsql statement: {call   cApex.update_sysmodstamp(?)}([       java.sql.SQLException: ORA-30006: resource busy; acquire with WAIT   timeout expiredORA-06512: at "BASHFUL.CAPEX", line 2715ORA-06512: at   line 1: SQLException while executing plsql statement: {call   cApex.update_sysmodstamp(?)}([       java.sql.SQLException: ORA-30006: resource busy; acquire with WAIT   timeout expiredORA-06512: at "SNEEZY.CAPEX", line 2718ORA-06512: at   line 1: SQLException while executing plsql statement: {call   cApex.invalidate_agc(?,?)}([      Error: ORA-20000: ORA-06512: at "SNEEZY.SIMPORTLOOKUP", line 850   ORA-06512: at "SNEEZY.SIMPORTLOOKUP", line 823 ORA-06512: at line 1 :   SQLException while executing plsql statement: {call   sImportLookup.get_by_ext_id_text(?,?,?,?,?,?,?)}([ what do it mean by "A real nxn matrix always has a real eigenvalue when n is odd?" Shouldnt it be that regardless of odd or even there will always have a real root?  hope to hear from you guys soon:) Prove that, $\binom{3n}{r}=\binom{3n-1}{r} + \binom{3n-1}{r-1}$ Reading through my textbook I came across the following problem and I am looking for some help solving it.  Prove that,  $$\binom{3n}{r}=\binom{3n-1}{r} + \binom{3n-1}{r-1}$$  In a previous problem I solved the following but I wasn't sure how to use it to prove the question above. Prove,  $$\binom{n}{r}=\binom{n}{n-r}$$  Solution:  left Side,  $$\binom{n}{r}=\frac{n!}{(n-r)!r!}$$  right side,  $$\binom{n}{n-r}=\frac{n!}{(n-(n-r))!(n-r)!} = \frac{n!}{(n-r)!r!}$$  Therefore completing the proof,  but how do I solve my first question? thanks! How can I change an element's class with JavaScript? Volumetric Windows 10 logo effect I'm trying to recreate the windows 10 background effect on a logo I've made in blender.  Half the logo has a glass like material, the other half has a steel like material. And I'm using cycles at the moment.  I've put various light sources behind the logo and tried a few variations of volumetric scatter in the world to get the god ray sort of feel coming off the logo, but it's just not looking anywhere near as effective as I'd like.  I know the win10 background was a real set and photographed, but has anyone come across a tutorial to do something similar in blender?  I'm very new to the tool, I'd appreciate any pointers in the right direction. What's the significance of conditional and absolute convergence? I know how to find if a series is conditional or absolute convergence by taking the absolute value and seeing if that absolute sum converges (then the original sum is absolute). If the absolute diverges but the original converges, then that's conditional.   But my question is: is there a significance? Is absolute convergence series bigger than absolute? Does a series being absolute or conditional affect rate of convergence, or radius? Does it affect symmetry?   Looking at Google, I only found tests on how to find if it's absolute or conditional. But I want to find meaning or significance. Or at least more mathematical properties. James Paterson in his novel writes, “she was shrink by trade, a forensic profiler, and Jack Morgan’s number two at Private “.   What does whole sentence mean? Why do I get different outputs in case of sh and bash? So far, I know if $p$ is a rational prime, then $(1)$ if $p\equiv 3\mod4$, then $p$ is prime in $\mathbb{Z}[i]$. $(2)$ If $p\equiv1\mod4$  then $p=π_1 π_2$ where $π_1 $ and $π_2$ are conjugate, Then $π_1 $ and $π_2$ are primes in $\mathbb{Z}[i]$. $(3)$ $2=(1+i)(1-i)$, then $(1+i)$and$(1-i)$ are primes in $\mathbb{Z}[i]$.  What's are all the prime elements in Gaussian integers $\mathbb{Z}[i]$? For example, $-3$ are prime in $\mathbb{Z}[i]$, but not in the above $3$ cases. understanding "mount" as a concept in the OS I want to understand what mounting is. It is used in different contexts and situations and I can't find resources which:   Describe the mount concept Explain the actions taken by the computer/OS/utility when a mount is performed How and in which situations mount is used Which features in the Linux mount command are of frequent use and some examples   ( I hear mount applied to diverse entities directories, flash drives, network card, etc ) Having line color vary with data index for line graph in matplotlib? Moment generating function of the inner product of two gaussian random vectors Can anybody please suggest how I can compute the moment generating function of the inner product of two Gaussian random vectors, each distributed as $\mathcal N(0,\sigma^2)$, independent of each other? Is there some standard result available for this? Any pointer is highly appreciated. Whenever I install vsftpd on centos, I only setup the jail environment for the users and rest is default configuration of vsftpd. I create user and try to connect with filezila ftp client, but I could not connect with passive mode. I always change the transfer settings to active mode to successfully connect to the ftp server otherwise I get        Error: Failed to retrieve directory listing   So is there a way to change any directive in vsftp.conf file and we can connect with passive mode to the server? Privilege banner buggy? Or am I just confused? On the main Stack Overflow site, I arrived and had a banner: "Congrats, you've gained the privilege – create wiki posts and 3 other privileges" This confuses me, because I only see two privileges listed at 100%. Is the banner just buggy?  Or is there a better place to see my privileges that the page linked to by that banner? I created some linestring features in EPSG:32632 (WGS 84 / UTM zone 32N) exactly 10 000 m long.  QGIS calculates all line lengths (horizontal, vertical, diagonal) as 10 001.9 m. The measure tool explains "Project CRS transformation is turned on and ellipsoidal calculation is selected. The coordinates are transformed to the chosen ellipsoid (WGS84), and the distance is calculated in meters."  When I set the ellipsoid to "None / Planimetric" in project properties, I get the expected results (10 000 m).  I don't understand the phrase "coordinates are transformed to the chosen ellipsoid (WGS84)", is it a transformation to unprojected degrees (4326?)? Since 32632 already is based on WGS84, is there anything to transform? If there is a kind of "great circle" calculation involved, I would have expected lengths can only get smaller.  Is QGIS's calculation correct/meaningful, is it plain wrong or do I see rounding errors?  This are the geometries I tested:  LineString (370000 5615000, 370000 5625000) LineString (366464.46609406732022762 5616464.46609406732022762, 373535.53390593267977238 5623535.53390593267977238) LineString (365000 5620000, 375000 5620000) LineString (373535.53390593267977238 5616464.46609406638890505, 366464.46609406638890505 5623535.5339059317484498)   Edit as addition to MappaGnosis's answer: I forgot that in UTM , this seems to be the simple answer for the title question. Self-references in object literals / initializers I wonder about the foundations of set theory and my question can be stated in some related forms:   If we base Zermelo–Fraenkel set theory on first order logic, does that mean first order logic is not allowed to contain the notion of sets? The axioms of Zermelo–Fraenkel set theory seem to already expect the notion of a set to be defined. Is there are pre-definition of what we are dealing with? And where? In set theory, if a function is defined as a set using tuples, why or how does first order logic and the axioms of Zermelo–Fraenkel set theory contain parameter dependend properties $\psi(u_1,u_2,q,...)$, which basically are functions? Is there an advantage to use a Synchronized Method instead of a Synchronized Block? Video editing software options?