I just installed RVM on Ubuntu 11.04,and I am comparing it with Python's virtualenv.
When I activate virtualenv it changes the prompt (on my Ubuntu system), so I know exactly which environment is active in that terminal. RVM on the other hand does not seem to do that. RVM also does not seem to need any activation.
Am I missing something here, or is this the way rvm works by default ?
You need to do it by yourself:
PS1="\$(~/.rvm/bin/rvm-prompt) $PS1"
more details here: https://rvm.io/workflow/prompt/
or you could build your own prompt like I do:
https://github.com/mpapis/home_dotfiles/blob/master/.bashrc#L17 +
https://github.com/mpapis/home_dotfiles/blob/master/.functions#L156-L160
Related
I am running WSL2 under Windows 10.
If I type "gedit &" into the WSL console, the Gedit application window pops up. Thus I assume that WSLg properly works.
Next, I am trying to run the following PyQt5 project:
https://github.com/rafaelpadilla/review_object_detection_metrics
However, no application window pops up this time, although no error message appears either.
First of all, I do wonder whether this could work at all with WSL!?
Appendix for additional context:
I am not using conda because of licensing issues, but a combination of pyenv + poetry instead. First I had problems with a missing library (libxcb.so), which I could solve by running "sudo apt python-pyqt5". Now everything seems to work, except from no application window being shown.
UPDATE:
I tried with "/src/pyqt-official/qtdemo/qtdemo.py" from the official PyQt Examples github repository and I observed exactly the same issue.
There is no error message. Last prompt informs me that the "xcb plugin was loaded“, then nothing happens. In particular, no window is showing up.
Some related observations:
(1) I haven't yet updated my grafics card driver to support vGPUs. However, Gedit works and opens in a separate window.
(2) Unless I do "sudo apt install python3-pyqt", I receive an error message saying that it cannot find "libxcb.so". However, I am running the code in a virtual pyenv/poetry environment, which is separate from the system python installation. I don't understand why "sudo apt install python3-pyqt" makes a difference here. Shouldn't installing "PyQt5" with poetry obtain a wheel that comes with all libraries already compiled? I don't understand how all of this is playing together.
Open Questions:
Do you think the driver issue could be an explanation? I actually cannot imagine that. I thought it is only about better performance for OpenGL applications.
Can you explain observation (2)?
What else can I do?
First of all, I do wonder whether this could work at all with WSL!?
I can't tell you if that particular application will run under WSL, but my expectation is that it will. As far as I can tell in its dependencies there doesn't seem to be any reliance on GPU compute. That, to me, would be the trickiest part to configure under WSL (but is still typically possible). However, there may be other dependencies (not covered below) that you need to get running before the application can work.
What I can confirm is that PyQt works under WSL just fine. However, keep in mind that a default Ubuntu installation under WSL is based on a non-GUI Ubuntu Server distribution, rather than standard Ubuntu (with a desktop and GUI).
This means that Ubuntu Server is often missing system level libraries needed for GUI support, which appears to be the case here.
I don't understand why "sudo apt install python3-pyqt" makes a difference here. Shouldn't installing "PyQt5" with poetry obtain a wheel that comes with all libraries already compiled?
Poetry and/or Pip manage the Python library dependencies, but those Python libraries still require the native system library dependencies. That's where sudo apt install python3-pyqt5 comes in. Under a desktop Ubuntu system, most of these libraries would already be in place. However, with Ubuntu Server/WSL, they aren't.
For reference, here's my configuration. On a freshly initialized Ubuntu 22.04 WSL2 distribution:
sudo apt update && sudo apt upgrade -y
sudo apt install python3-venv python3-pyqt5
mkdir -p src/pyqt_test
cd src/pyqt_test
python3 -m venv .venv
source .venv/bin/activate
pip install pyqt5
I was then able to create and run the following, taken from Learn Python PyQt:
import sys
from PyQt5 import QtWidgets
app = QtWidgets.QApplication(sys.argv)
windows = QtWidgets.QWidget()
windows.resize(500,500)
windows.move(100,100)
windows.show()
sys.exit(app.exec_())
The window displayed correctly.
Ruby updated to version 1.8.7 and the redmine display at the top right side "Not Running" The issue that I found is that doesn't send mailing alerts to users when the status of one task change.
The redmine save tasks normally.
Do you know why I get "Not running"?
Do you know how can I found what is not running?
Do you know how the mail alerts will work as before?
Also the redmine is hosted in cPanel.
First of all your Ruby version is very old and non-maintaned, you should look for 2.4.x versions.
I recommend that you install new ruby via rvm or rbenv
So if you are to proceed with RVM, it's easy to install via console, it first imports the key
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
And then installs via curl and bash (your should ask for permission to use bash, because often with cpanel, the only shell users can use is some kind of jailshell)
\curl -sSL https://get.rvm.io | bash -s stable
Once RVM is installed, you will be able to install new ruby for that particular user, by typing rvm install rubyversion replace rubyversion with one of your choice.
And then proceed with Redmine upgrade, as explained in manual
http://www.redmine.org/projects/redmine/wiki/RedmineUpgrade
Once you are done with that, you must figure out, how is your redmine being served, I assume it's served as fcgi module, since it's old version of ruby, so you might have to seek for a way to run your Redmine with new ruby, I recommend to try this approach first How to get rvm running inside fcgi?
There are several ways to deploy rails app like Redmine on a web-server, however running under cpanel gives you little or no choices, alternative would be to run some server like thin, or webrick, and proxy it thru apache, which should be possible with cpanel.
I tried installing Gnuradio 3.7.9.2 using build-gnuradio script and apart from a few hiccups due to some packages (which I installed and re-ran the script again) , the script completed its run successfully (I enabled the verbose option of the script to check the output). I even added the PYTHONPATH to the .bashrc script after completing the installation. When I tried launching gnuradio-companion though, it doesnt recognise the command.
:~$ gnuradio-companion
The program 'gnuradio-companion' is currently not installed. You can install it by typing:
sudo apt-get install gnuradio
So, I was wondering whether I need to install grc separately after the build-gnuradio script installation ?. I apologise if this is too simple, I have tried the installation many times and searched the web for problems like this. To the best of my efforts, I was not able to find any. It would be great, if anyone can point to any existing question similar to this, or guide me in fixing this issue. Thank you.
It is advised to use PyBOMBS to install GNU Radio. Installing Out-of-Tree modules (OOTs) will be much easier afterwards. As for your problem: Did you check if your $PATH variable (echo $PATH) contains /usr/local/bin/? This should be the default installation path for a non-system install of GNU Radio.
Alternatively you can try to run /usr/local/bin/gnuradio-companion.
I tried to install mono and monodevelop on centOS 6.3.
After many hours I was able to install mono but failed with monodevelop.
I'm really astonished how difficult and time consuming it is, to get a recent mono/monodevelop version on linux installed.
Is there nobody willing to write and maintain an install/compile tutorial to get the most recent mono/monodevelop/monodata/ASP.NET MVC/... version on the major linux distributions (Centos, Ubuntu, Suse, Debian) installed?
I think many people developing on Windows (with limited linux knowledge) would like to start using mono, if the boarding hurdle would be somehow lower.
It may be the most important to make Mono more used and more visible.
Please, write a tested tutorial (script) for compiling mono/monodevelop.
Thank you!
I have created a project on Open Build Service, which produces builds of the latest MonoDevelop 4.0.10 for Debian, Ubuntu, CentOS, and Fedora.
see https://build.opensuse.org/project/show/home:tpokorra:mono
For installation instructions with apt-get or yum, see:
http://software.opensuse.org/download/package?project=home:tpokorra:mono&package=monodevelop-opt
I hope this will increase the usage of MonoDevelop on Linux Desktop environments.
Monodevelop 4.
If you use any *buntu. Check this.
"You can open up the terminal and install it via the following:
1. sudo add-apt-repository ppa:keks9n/monodevelop-latest
2. sudo apt-get update
3. sudo apt-get install monodevelop-latest"
http://mono-d.alexanderbothe.com/?p=101
Xamarin should be doing a better job at publishing the linux packages in a one-click manner. I don't care what linux distro (SuSE, RHEL, CentOS, Ubuntu etc) - just pick any one as the supported one and publish for it. It seemed that it used to be SuSE but even that has old packages as seen within Zypper/YaST.
Update Mono framework
Having said that, to update the Mono framework itself, without letting go of the package managers try this. This will work as long as the project dutifully publishes the RPMs. You don't want to build from source since it's a more fickle process and the setup distracts from your real objective (i.e. develop).
Obviously, please replace the URL below to what will be latest by the time you're reading this.
mkdir mono-rpms
cd mono-rpms
wget --reject "index.html*" -nd -r -e robots=off --no-parent http://download.mono-project.com/archive/3.2.3/linux/x64/
sudo zypper install *rpm
Update MonoDevelop (the IDE)
Timotheus Pokorra's answer indicates he's filling in some of the usability void left by Xamarin (Thanks Timotheus!!). You can install MonoDevelop via
http://software.opensuse.org/download/package?project=home:tpokorra:mono&package=monodevelop-opt
Note that on SuSE I get the error
Problem: nothing provides liberation-mono-fonts needed by mono-libgdiplus-opt-3.0.12-7.1.x86_64
Solution 1: do not install monodevelop-opt-4.0.12-5.2.x86_64
Solution 2: break mono-libgdiplus-opt-3.0.12-7.1.x86_64 by ignoring some of its dependencies
I (very reluctantly) selected to break the dependency. Note that I already had liberation-fonts (via sudo zypper install liberation-fonts). I don't know if its the same/different as liberation-mono-fonts. Anyway, hope Timotheus fixes it when he has a moment.
I'm not sure if you've already seen this, but this may help:
http://www.mono-project.com/Parallel_Mono_Environments
The most common problem that new developers have when coming to Linux from systems like Windows is not properly setting up their environment variables and so when they do the standard ./configure && make && make install routine, when it involves a number of source packages (like Mono does), any package that depends on the core package won't pick up the correct location for that base package.
Your question really doesn't explain what parts you found confusing or difficult so it's hard to address those issues.
For people unfamiliar with setting up Linux systems, it may be easier if you just go with a system like Ubuntu which has fairly recent pre-built packages (although not the latest - I don't think any Linux system keeps up with Mono releases) rather than wrestling with the learning curve of how to build everything yourself.
It is confirmed that in the near future Xamarin will support Linux and provide binaries (mono and mainline applications) for Debian and Centos derivatives, and their are already packages for Debian and Centos derivatives for technical preview. So cheers and no more pain of compiling and even parallel mono installaions.It can not get more easy than this. Check here
I am on ubuntu 12.04.1 LTS.
I have installed apache2 running as www-data.
I want to use ruby 1.9.3.
I need to install passanger.
The question is which installation method should I use to install rvm. Should I use the single-user or the multi-user installation.
If I have to use the single-user installation, do I install it as my user or as www-data.
On my production systems, I install RVM system-wide. That way I can log in (or anyone else can login) and pull up a console on the system using the same ruby and gemsets. I am sure there are ways to do that with single user, but this has always been the least complicated for me.
However, for Passenger, I recommend installing that against the system ruby. The reason for that is because every time you change or upgrade your ruby, it would blow up your passenger installation and you would need to change your Apache configuration and rerun the passenger installation. This works because passenger and your application do not need to run on the same ruby installation.