Questions[gem](ubuntu)

I used snap to install the latest version of ruby under Ubuntu 16.04

$ sudo snap install ruby --classic
$ which ruby
/snap/bin/ruby
$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]

Then I installed a ruby gem pdfbeads (a PDF creation utility program)

sudo gem install pdfbeads

This command installs the utility in my home directory as ~/.gem/gems/pdfbeads-1.1.1/bin/pdfbeads. However, when I try to use this program within a shell script that converts DJVU files into PDF format, I get the following error message

djvu2pdf.sh: line 43: pdfbeads: command not found

While ruby linked in /snap/bin/ is in my $PATH by default, ~/.gem/ is not. Here's the gem environment after installation of pdfbeads:

$ gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 3.1.2
  - RUBY VERSION: 2.7.0 (2019-12-25 patchlevel 0) [x86_64-linux]
  - INSTALLATION DIRECTORY: ~/.gem
  - USER INSTALLATION DIRECTORY: ~/.gem/ruby/2.7.0
  - RUBY EXECUTABLE: /snap/bin/ruby
  - GIT EXECUTABLE: /usr/bin/git
  - EXECUTABLE DIRECTORY: ~/.gem/bin
  - SPEC CACHE DIRECTORY: ~/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: //etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - ~/.gem
     - /snap/ruby/172/lib/ruby/gems/2.7.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /usr/local/sbin
     - /usr/local/bin
     - /usr/sbin
     - /usr/bin
     - /sbin
     - /bin
     - /usr/games
     - /usr/local/games
     - /snap/bin

I would have expected that the gem package installation should have taken care of the path issue, but that's not apparently the case - pdfbeads is not in the execution directory path.

Clearly, I could add this one specific directory ~/.gem/gems/pdfbeads-1.1.1/bin/ to my $PATH to solve this particular problem. However, as this is my first use of ruby, I'm looking for a more general solution that would not require doing the same every time I install another ruby gem.

I've got a question for all the ruby experts - is there some standard, more elegant way of resolving this issue that would also cover any future gem installations?

Trying to install pdfbeads on Ubuntu LTS 16.04 with the command $ gem install pdfbeads I'm getting the error message "ERROR: Can't install RMagick 4.0.0. Can't find ImageMagick with pkg-config"

Below between the separators is the corresponding stdout.

$ sudo gem install pdfbeads

Building native extensions. This could take a while... Successfully installed nokogiri-1.10.7 Building native extensions. This could take a while... ERROR: Error installing pdfbeads: ERROR: Failed to build gem native extension.

current directory: /home/enemem/.gem/gems/rmagick-4.0.0/ext/RMagick

/snap/bin/ruby -I /snap/ruby/172/lib/ruby/2.7.0 -r ./siteconf20200127-10722-yuiix4.rb extconf.rb checking for brew... no checking for pacman... no checking for gcc... yes checking for pkg-config... yes

ERROR: Can't install RMagick 4.0.0. Can't find ImageMagick with pkg-config

* extconf.rb failed * Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.

Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/snap/ruby/172/bin/$(RUBY_BASE_NAME)

Checked the mkmf.log file but it containe the same info, verbatim.

Then I tried to use the command

$ pkg-config --modversion imagemagick

and got this output:

Package imagemagick was not found in the pkg-config search path. Perhaps you should add the directory containing `imagemagick.pc' to the PKG_CONFIG_PATH environment variable No package 'imagemagick' found

Following up on this suggestion I tried to find where imagemagick is on my system by running:

$ sudo locate -b '\imagemagick*'

and got the output:

/usr/lib/mime/packages/imagemagick /usr/share/app-install/desktop/imagemagick-6.q16:display-im6.q16.desktop /usr/share/app-install/desktop/imagemagick:display-im6.desktop /usr/share/bug/imagemagick /usr/share/cups/ppdc/imagemagick.defs /usr/share/doc/imagemagick /usr/share/doc/imagemagick-6.q16 /usr/share/doc/imagemagick-common /usr/share/menu/imagemagick /var/lib/app-info/icons/ubuntu-xenial-main/64x64/imagemagick-6.q16_display-im6.q16.png /var/lib/app-info/icons/ubuntu-xenial-main/64x64/imagemagick_display-im6.q16.png /var/lib/app-info/icons/ubuntu-xenial-security-main/64x64/imagemagick-6.q16_display-im6.q16.png /var/lib/app-info/icons/ubuntu-xenial-security-main/64x64/imagemagick_display-im6.q16.png /var/lib/app-info/icons/ubuntu-xenial-updates-main/64x64/imagemagick-6.q16_display-im6.q16.png /var/lib/app-info/icons/ubuntu-xenial-updates-main/64x64/imagemagick_display-im6.q16.png /var/lib/dpkg/info/imagemagick-6.q16.list /var/lib/dpkg/info/imagemagick-6.q16.md5sums /var/lib/dpkg/info/imagemagick-common.conffiles /var/lib/dpkg/info/imagemagick-common.list /var/lib/dpkg/info/imagemagick-common.md5sums /var/lib/dpkg/info/imagemagick-common.postinst /var/lib/dpkg/info/imagemagick-common.postrm /var/lib/dpkg/info/imagemagick-common.preinst /var/lib/dpkg/info/imagemagick.list /var/lib/dpkg/info/imagemagick.md5sums /var/lib/dpkg/info/imagemagick.postinst /var/lib/dpkg/info/imagemagick.postrm /var/lib/dpkg/info/imagemagick.prerm

Version of the imagemagick package on my system is 6.8.9.9

$ sudo apt search ImageMagick | grep installed

imagemagick/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed] imagemagick-6.q16/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed] imagemagick-common/xenial-updates,xenial-updates,xenial-security,xenial-security,now 8:6.8.9.9-7ubuntu5.15 all [installed] libgraphicsmagick++-q16-12/xenial-updates,xenial-security,now 1.3.23-1ubuntu0.5 amd64 [installed,automatic] libgraphicsmagick-q16-3/xenial-updates,xenial-security,now 1.3.23-1ubuntu0.5 amd64 [installed,automatic] libimage-magick-perl/xenial-updates,xenial-updates,xenial-security,xenial-security,now 8:6.8.9.9-7ubuntu5.15 all [installed,automatic] libimage-magick-q16-perl/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed,automatic] libmagick++-6.q16-5v5/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed,automatic] libmagickcore-6.q16-2/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed] libmagickwand-6.q16-2/xenial-updates,xenial-security,now 8:6.8.9.9-7ubuntu5.15 amd64 [installed] perlmagick/xenial-updates,xenial-updates,xenial-security,xenial-security,now 8:6.8.9.9-7ubuntu5.15 all [installed,automatic]

Can anyone help?

Multiple packages upgraded like gem, ruby and its plugins. Now when I run vagrant up I get:

Vagrant failed to initialize at a very early stage:

The plugins failed to initialize correctly. This may be due to manual
modifications made within the Vagrant home directory. Vagrant can
attempt to automatically correct this issue by running:

  vagrant plugin repair

If Vagrant was recently updated, this error may be due to incompatible
versions of dependencies. To fix this problem please remove and re-install
all plugins. Vagrant can attempt to do this automatically by running:

  vagrant plugin expunge --reinstall

Or you may want to try updating the installed plugins to their latest
versions:

  vagrant plugin update

Error message given during initialization: Unable to resolve dependency: 'fog-libvirt (>= 0.3.0)' requires 'ruby-libvirt (>= 0.7.0)'

I even removed the whole vagrant by sudo apt-get remove --purge vagrant but after fresh installation error keeps showing.

I tried to reinstall sudo gem install ruby-libvirt but nothing happened.

Is there something that I can try on Ubuntu to solve this problem and make vagrant up & running?

EDIT-1:

vagrant plugin repair displays:

Repairing currently installed plugins. This may take a few minutes...
Failed to automatically repair installed Vagrant plugins. To fix this
problem remove all user installed plugins and reinstall. Vagrant can
do this for you automatically by running the following command:

  vagrant plugin expunge --reinstall

Failure message received during repair:

Unable to resolve dependency: user requested 'vagrant-libvirt (> 0)

Then using vagrant plugin expunge --reinstall:

This command permanently deletes all currently installed user plugins. It
should only be used when a repair command is unable to properly fix the
system.

Continue? [N]: Y

All user installed plugins have been removed from this Vagrant environment!

Vagrant will now attempt to reinstall user plugins that were removed.

I wanted to install sass version 3.2.0 alpha.

I first ran sudo apt-get install libhaml-ruby1.8, which is what the console recommended It successfully installed, but it installed an older version of sass.

Just in case, I tried installing it via rubygems:

sudo apt-get install rubygems1.8
sudo gem install sass

This just reinstalled sass 3.1.17. As per the recommendation here, I tried running the following:

sudo gem uninstall -Iax sass
sudo gem install sass --pre

This stated that sass 3.2.0 alpha was successfully installed. However, sass no longer seems to work at all. Typing

sass --watch styles.scss

...returns...

The program 'sass' is currently not installed.  You can install it by typing:
suto apt-get install libhaml-ruby1.8

So now I've gone full circle. What can I do to get sass working from the console?

Following this tutorial here, to install ruby on rails on ubuntu 11.10 with sqlite3

when I run the following command

sudo gem install rails

I get the following error :

ERROR: Could not find a valid gem 'rails' (>= 0) in any repository

Also, when I try the command,

sudo gem install sqlite3

I get the same error

ERROR: Could not find a valid gem 'sqlite3' (>= 0) in any repository

How do I resolve this?