I have a problem while upgrading from Ubuntu 14.04 to 18.04. We have few thousand devices on Ubuntu 14.04 that need to be upgraded to 18.04. I have tried to upgrade to  16.04 first. But when I try do-release-upgrade I get &quot;No new release found&quot;. What I'm trying is below. ## edit /etc/update-manager/release-upgrades, change never as lts sed -i &quot;/Prompt=/c\Prompt=lts&quot; /etc/update-manager/release-upgrades  ## to make dpkg continue non-interactively echo &quot;force-confdef&quot; &gt;&gt; /etc/dpkg/dpkg.conf echo &quot;force-confold&quot; &gt;&gt; /etc/dpkg/dpkg.conf  # to upgrade non-interactively  export DEBIAN_FRONTEND=noninteractive  ## update, upgrade and do-release-upgrade apt-get -o Dpkg::Options::=&quot;--force-confdef&quot; -o Dpkg::Options::=&quot;--force-confold&quot; upgrade apt-get -o Dpkg::Options::=&quot;--force-confdef&quot; -o Dpkg::Options::=&quot;--force-confold&quot; dist-upgrade do-release-upgrade -d -f DistUpgradeViewNonInteractive
Recently I have installed an older version of Ubuntu on my old machine. Whenever I try to install any software, I get an error saying it couldn't be found:  $ sudo apt-get install vlc Reading package lists... Done                Building dependency tree        Reading state information... Done     E: Couldn't find package vlc
References in Chapter Titles External Styles in JasperReports I'm working on a system that includes a large number of reports, generated using . One of the newer features is that you can define styles for reports.  From the available docs I believe there is some way to have an external file defining styles to use, and you can reference that in your jasper reports. This allows a single style to be used by multiple reports.  I can't find any concrete information on whether this is an actual feature, and if it is, how to use it. Does anyone know if it is possible to have external styles for jasper reports, and if so, how to do it? Automatically run commands over SSH on many servers There is a list of IP addresses in a .txt file, ex.:  1.1.1.1 2.2.2.2 3.3.3.3   Behind every IP address there is a server, and on every server there is an sshd running on port 22. Not every server is in the known_hosts list (on my PC, Ubuntu 10.04 LTS/bash).  How can I run commands on these servers, and collect the output?  Ideally, I'd like to run the commands in parallel on all the servers.  I'll be using public key authentication on all the servers.  Here are some potential pitfalls:   The ssh prompts me to put the given servers ssh key to my known_hosts file. The given commands might return a nonzero exit code, indicating that the output is potentially invalid. I need to recognize that. A connection might fail to be established to a given server, for example because of a network error. There should be a timeout, in case the command runs for longer than expected or the server goes down while running the command.   The servers are AIX/ksh (but I think that doesn't really matter. I know, it's been asked before but I couldn't really get a satisfying answer for some details/backgrounds and I guess it's an important question for many.    Some application seem only to be running with Adobe Flash 15 (or at least I know it does, because I have that version on my Windows Partition).  The official Adobe website says:     NOTE: Adobe Flash Player 11.2 will be the last version to target Linux as a supported platform. Adobe will continue to provide security backports to Flash Player 11.2 for Linux.   Some search on the web like "Ubuntu Adobe Flash 15" or similar does not return any good websites.  I found something that says   (using a "pepper-based version"), and  .   Is it impossible to use this for Firefox too? Would it be a privacy risk?  Are there no alternative projects (I know it's closed source but there are so many so very bright people out there using something similar to wine but just for the plugin....)?  How about the Mac-Version? Shouldn't someone be able to port that one to Linux? Is my model any good, based on the diagnostic metric ($R^2$/ AUC/ accuracy/ RMSE etc.) value? How to integrate OpenCV Manager in Android App extract lines that match a list of words in another file I have file 1 which have those lines:  ATM 1434.972183 BMPR2 10762.78192 BMPR2 10762.78192 BMPR2 1469.14535 BMPR2 1469.14535 BMPR2 1738.479639 BMS1 4907.841667 BMS1 4907.841667 BMS1 880.4532628 BMS1 880.4532628 BMS1P17 1249.75 BMS1P17 1249.75 BMS1P17 1606.821429 BMS1P17 1606.821429 BMS1P17 1666.333333 BMS1P17 1666.333333 BMS1P17 2108.460317 BMS1P17 2108   And file 2 have a list of words:  ATM BMS1   So, the output will be like this:  ATM 1434.972183 BMS1 4907.841667 BMS1 4907.841667 BMS1 880.4532628 BMS1 880.4532628   I know it's really a duplicate question, but I tried all types of grep and sed and awk, maybe it will works with you guys with this tiny example  but I have a very huge file &gt; 1M lines and all previous way doesn't help  it return part of the lines that containing those words although there are other words in file 2 that matches the lines from file 1 What's the term for denying something so as to raise doubt? Topical example:  'There was a scuffle outside the local pub. There appears to be no connection with religious extremists.'  ...but now you're wondering if there was. It's a nasty tactic used to raise fear and doubt - deliberately calling attention to something by explicitly denying it.  What's the term for this? Why massless particles have zero chemical potential? Java reflection: how to get field value from an object, not knowing its class What's the best practice of inserting a collection of data into a SQL Server database What are the differences between Generics in C# and Java... and Templates in C++? If $x^n + a_{n-1}x^{n-1} + ... + a_0 = 0$ has a rational root, then such root is an integer Let $n &gt; 0$ and let $a_{n-1}, ..., a_0$ be integers. Prove that, if $x^n + a_{n-1}x^{n-1} + ... + a_0 = 0$ has a rational root, then such root is an integer.   I understand that posting questions without showing your work is frowned upon, but I don't know where to start with this one.. thanks in advance. According to the , 3rd edition:        I wish to understand why this decision has been made. What's wrong with generic exceptions?  (As far as I know, generics are simply compile-time syntactic sugar, and they will be translated to Object anyway in the .class files, so effectively declaring a generic class is as if everything in it was an Object. Please correct me if I'm wrong.) Why can't the Klein-Gordon equation explain the hydrogen atom but the Dirac equation does? Why can't the Klein-Gordon equation with a Couloumb potential describe the hydrogen atom?  Why can the first order Dirac equation explain it? What are the failures? Entropy and the principle of least action Is there any link between the law of maximum entropy and the principle of least action. Is it possible to derive one from the other ? Is there a built-in function to print all the current properties and values of an object? The difference between sys.stdout.write and print? Find all functions $f(x)$ such that $f\left(x^2+f(y)\right)$=$y+(f(x))^2$ Let $\mathbb R$ denote the set of all real numbers. Find all function $f: R\to \ R$ such that   $$f\left(x^2+f(y)\right)=y+(f(x))^2$$   It is the problem. I tried to it by putting many at the place of $x$ and $y$ but I can't proceed. Please somebody help me. Can someone tell me if $\frac{3}{5}$, $2+3\sqrt{-5}$, $\frac{3+8\sqrt{-5}}{2}$, $\frac{3+8\sqrt{-5}}{5}$, $i\sqrt{-5}$ are all quadratic integers in $\mathbb Q[\sqrt{-5}]$. And if so why are they in $\mathbb Q[\sqrt{-5}]$.