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A. N. Other's questions

Martin Hope
A. N. Other
Asked: 2018-02-18 07:28:38 +0800 CST
  • 0

I just installed scala on Ubuntu 

scala -version
Scala code runner version 2.11.6 -- Copyright 2002-2013, LAMP/EPFL

but when I try to run the scala command for an interactive shell session I have the following error: 

Exception in thread "main" java.lang.NoClassDefFoundError: javax/script/Compilable
    at scala.tools.nsc.interpreter.ILoop.createInterpreter(ILoop.scala:126)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:908)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:906)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:906)
    at scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
    at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:906)
    at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
    at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
    at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
command-line scala
Martin Hope
A. N. Other
Asked: 2017-08-31 05:46:38 +0800 CST
  • 1

I am trying to install Rusti (the Rust programming language interactive shell) from https://github.com/murarth/rusti

But after this command, (as suggested in the GitHub page) 

rustup run nightly-2016-08-01 cargo install --git https://github.com/murarth/rusti

I get this message

error: aborting due to previous error error: failed to compile rusti v0.0.1 (https://github.com/murarth/rusti#9a1eff33), intermediate artifacts can be found at /tmp/cargo-install.DeH3oix9x8l3

Caused by: Could not compile rusti.

Any help would be appreciated, I am on Ubuntu 16.04.

rust
Martin Hope
A. N. Other
Asked: 2017-07-16 00:40:31 +0800 CST
  • 0

I downloaded Android Studio and I have a folder named android-studio in my Downloads folder. I can launch it with 

cd ~/Downloads/android-studio/bin

and then

./studio.sh

(It's strange, by the way, that I already have execute permissions on this file...)

Anyway, how can I add Android Studio to Dash, so that I can launch it as all the other apps? If I lock it to Launcher, and then try to open it from there, nothing happens.

android-studio
Martin Hope
A. N. Other
Asked: 2017-07-06 12:59:53 +0800 CST
  • 2

This question is actually non Ubuntu-specific. My understanding is that sudo is to prevent non-authorized users from doing administrative and other potentially harmful operations. The premise is that someone is here in front of my PC using it... or maybe remotely (but in that case they should know my login password to connect to the computer, and this is usually the same as my sudo password...) So someone is in front of my PC and she cannot delete certain important files or dirs or install harmful software without knowing my sudo password, but she can do a lot of other harmful and privacy-violating things without sudo. So, wouldn't it be better instead asking for admin privileges each time before opening the file manager or the terminal? I know this may be time-consuming and exhausting...

command-line
Martin Hope
A. N. Other
Asked: 2017-07-04 05:37:31 +0800 CST
  • 3

How do I know what programming languages (I mean their compilers and interpreters) are already pre-installed in Ubuntu? For example, I see that Python is here. If I type python command in the terminal, it turns out that I have python version 2.7.12. But what about other popular programming and scripting languages like Ruby, Perl, C, Lua, awk, Java, PHP, etc. etc. Should I try to launch them in the terminal or try something like language --version one by one, or is there a better way to know this?

python
Martin Hope
A. N. Other
Asked: 2017-07-02 06:05:32 +0800 CST
  • 2

I am on Ubuntu 16.04 LTS. What is my mysql root password? If I enter

mysql -u root -p

It asks me to enter a password: I don't know it, and no password won't work either. Mysql was pre-installed, so I didn't choose any root password. If I try to install it again, with 

sudo apt-get install mysql-server

It says that mysql-server is already the newest version (5.7.18-0ubuntu0.16.04.1)

Any help, hints? Thanks.

mysql