If you have setup guard with your Rails project and you are trying to run it in an (K)Ubuntu installation you get the following message:

Could not open library 'libgtkmm-2.4.so': libgtkmm-2.4.so: cannot open shared object file: No such file or directory.

Solution

Install the missing library with the following:

sudo apt-get install libgtkmm-2.4

You want to use the rmagick gem in your rails application after a new (K)ubuntu system installation, but the bundler command gives you errors.

Solution

Install the following before running budler again:

sudo apt-get install imagemagick libmagickcore-dev libmagickwand-dev

Solution
You would need to do the following:

as root

• bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

for each individual user you want to use rvm

• in the user’s .bashrc or .bashrc_profile add the following at the bottom:
  [[ -s "/usr/local/rvm/scripts/rvm" ]] && source "/usr/local/rvm/scripts/rvm" # This loads RVM into a shell session.
• reload the .bashrc or .bashrc_profile by:
  source .bashrc|.bashrc_profile

and you should be able to do rvm -v.

error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory

Solution
Use the urpmf command to find the packages that contain the missing libraries like :

urpmf libasound.so.2

and then when you get something like the following:

lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0

install the missing packages with:

sudo urpmi lib64alsa2
or/and
sudo urpmi libalsa2

Solution
To be able to use the available space the quickest solution is:

• restart your VMware session but run in safe mode
• start up drakdisk
• select the partition you want to resize. WARNING (Make sure you back up important data – even though in my case everything went smoothly)
• umount the select partition and resize using all the avaliable free space
• after a few minutes you should be able to restart your VMware and login to your virtual machine as normal, and the partition should be resized

** [192.168.0.50 :: err] Host key verification failed.
** [192.168.0.50 :: err] fatal: The remote end hung up unexpectedly

Solution
You would need to login to your staging server (as your deployment user) and do an initial checkout for one time for the ssh keys to work.
So you could do something like the following:

$ ssh user_name@staging_server
$sh -c 'git clone -q git_user@192.168.0.50:repo_name /some/tmp/dir/temp_repo_name

Make sure that you reply ‘y’ to the question about the authenticity of the host as in:
The authenticity of host '192.168.0.50 (192.168.0.50)' can't be established.
RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xxb.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.50' (RSA) to the list of known hosts.

Net delete the newly created git project from your tmp directory, and then you should be able to use cap deploy as normal again from your development pc

You tried to assign a String or a Pathname to an uploader, for security reasons, this is not allowed.

That happens if you try to assign inside your factory template, to your file field the path like f.file “path_to_file”

Solution

You would need to slightly modify your factory template to use the file path as follows:

f.file File.open(File.join(Rails.root,"path_to_file"))

Solution
If Imagemagick is not already installed, use the following to install it:
$ sudo apt-get install imagemagick

Then install the development librarires for both the imagemagick and the MagickWand as in:
$ sudo apt get install libmagick-dev libmagickwand-dev

You should then be able to install and use the rmagick gem

When you try to run the console rails c in a new Rails 3.0.7 application, in Mandriva 2011 64bit, and when you use rvm, you get the following error:

no such file to load -- readline (LoadError)

Solution

Similar to an earlier post here, the solution is as follows with the new requirements described

It’s quite like likely that the readline libraries are missing from your installation. To find out which ones go to the directory that the error is indicating (ie):

cd ~/.rvm/src/ruby-1.9..2-head

and then to the following:

cd ext/readline

then run the following:

ruby extconf.rb

If you get something like:
checking for readline/readline.h... no
checking for editline/readline.h... no

then you are probably missing the neccessary header files for readline.
so install them in your system (ie in Mandriva):

sudo urpmi lib64readline-dev,

When the package is installed successfully run the following again:

ruby extconf.rb
make
sudo make install

You should now be able to go back to your project and run rails c with no errors.

Solution
You would need to install Mandriva’s openldap-clients package that includes the ldapsearch:

sudo urpmi openldap-clients