Also affected - gem2.0 is totally stuffed with this. It seems like if
your system didn't already have a recent version of psych installed
before the upgrade (maybe) then you can't use it...
I tried using the safe_yaml that seems to be bundled with ruby (or
perhaps it was pre-installed?), but that fails to...
ruby2.0 -r safe_yaml -r rubygems/safe_yaml -S gem install psych --version
2.0.17 --backtrace
ERROR: While executing gem ... (ArgumentError)
wrong number of arguments (4 for 1..3)
/usr/lib/ruby/vendor_ruby/safe_yaml/load.rb:136:in `load'
/usr/lib/ruby/vendor_ruby/safe_yaml.rb:29:in `safe_load'
/usr/lib/ruby/2.0.0/rubygems/safe_yaml.rb:31:in `safe_load'
/usr/lib/ruby/2.0.0/rubygems/package.rb:445:in `block (2 levels) in
read_checksums'
/usr/lib/ruby/2.0.0/rubygems/package.rb:444:in `wrap'
/usr/lib/ruby/2.0.0/rubygems/package.rb:444:in `block in read_checksums'
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https://bugs.launchpad.net/bugs/1777174
Title:
2.0.0.484-1ubuntu2.10 triggers uninitialized constant Gem::SafeYAML on
calling gem2.0 install
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