rbot fails to load, possible ruby/gettext issue

[PeterJCLaw]

I'm using an x64 system, with a British locale. Having installed rbot & tried to run it, it crashes immediately, even if passed "--help"!
I've tried installing ruby-full in addition, which had no effect.

The actual crash:
$ rbot
/usr/lib/ruby/vendor_ruby/rbot/ircbot.rb:976: warning: assigned but unused variable - e
/usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36: warning: assigned but unused variable - gemname
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from /usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36.
NOTE: Gem::SourceIndex#each is deprecated with no replacement. It will be removed on or after 2011-11-01.
Gem::SourceIndex#each called from /usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36.
/usr/lib/ruby/vendor_ruby/rbot/load-gettext.rb:74: warning: assigned but unused variable - ret
/usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain_manager.rb:82: warning: assigned but unused variable - msg
/usr/lib/ruby/vendor_ruby/gettext/runtime/mofile.rb:188: warning: assigned but unused variable - i
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:88: warning: `%' after local variable is interpreted as binary operator
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:88: warning: even though it seems like string literal
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:101: warning: assigned but unused variable - search_files
log writing failed. stack level too deep
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/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:65:in `%': key{locale} not found (KeyError)
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:65:in `block in default_path_rules'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:64:in `select'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:64:in `default_path_rules'
 from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:80:in `block in default_path_rules'
 from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:95:in `block in _memoize_dup'
 from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:87:in `_memoize'
 from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:95:in `_memoize_dup'
 from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:79:in `default_path_rules'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:82:in `initialize'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain.rb:62:in `new'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain.rb:62:in `initialize'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain_manager.rb:227:in `new'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain_manager.rb:227:in `create_or_find_textdomain'
 from /usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain_manager.rb:71:in `bind_to'
 from /usr/lib/ruby/vendor_ruby/gettext.rb:85:in `bindtextdomain_to'
 from /usr/lib/ruby/vendor_ruby/gettext.rb:66:in `bindtextdomain'
 from /usr/lib/ruby/vendor_ruby/rbot/load-gettext.rb:44:in `<top (required)>'
 from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
 from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
 from /usr/lib/ruby/vendor_ruby/rbot/ircbot.rb:144:in `<top (required)>'
 from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
 from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
 from /usr/bin/rbot:94:in `<main>'

Infos I hope are useful:
$ lsb_release -rd
Description: Ubuntu 12.10
Release: 12.10
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.10
DISTRIB_CODENAME=quantal
DISTRIB_DESCRIPTION="Ubuntu 12.10"
$ uname -a
Linux <name-redacted> 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ locale
LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
LC_CTYPE="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER="en_GB.UTF-8"
LC_NAME="en_GB.UTF-8"
LC_ADDRESS="en_GB.UTF-8"
LC_TELEPHONE="en_GB.UTF-8"
LC_MEASUREMENT="en_GB.UTF-8"
LC_IDENTIFICATION="en_GB.UTF-8"
LC_ALL=
$ apt-cache policy rbot
rbot:
  Installed: 0.9.15+post20100705+gitb3aa806-3
  Candidate: 0.9.15+post20100705+gitb3aa806-3
  Version table:
 *** 0.9.15+post20100705+gitb3aa806-3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ quantal/universe amd64 Packages
        100 /var/lib/dpkg/status
$ apt-cache policy ruby
ruby:
  Installed: 4.9
  Candidate: 4.9
  Version table:
 *** 4.9 0
        500 http://gb.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
        100 /var/lib/dpkg/status
$ apt-cache policy ruby-locale
ruby-locale:
  Installed: 2.0.5-5
  Candidate: 2.0.5-5
  Version table:
 *** 2.0.5-5 0
        500 http://gb.archive.ubuntu.com/ubuntu/ quantal/universe amd64 Packages
        100 /var/lib/dpkg/status

[Derrick Coetzee (o-dc)]

I am also experiencing this issue. I am on Ubuntu 12.10 x64 with a US locale, and upon running rbot receive this output:

/usr/lib/ruby/vendor_ruby/rbot/ircbot.rb:976: warning: assigned but unused variable - e
/usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36: warning: assigned but unused variable - gemname
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from /usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36.
D, [2013/08/15 23:13:45#15449] DEBUG -- ircbot.rb:127:in `<top (required)>': debug test
I, [2013/08/15 23:13:45#15449] INFO -- ircbot.rb:128:in `<top (required)>': log test
W, [2013/08/15 23:13:45#15449] WARN -- ircbot.rb:129:in `<top (required)>': warning test
E, [2013/08/15 23:13:45#15449] ERROR -- ircbot.rb:130:in `<top (required)>': error test
F, [2013/08/15 23:13:45#15449] FATAL -- ircbot.rb:131:in `<top (required)>': fatal test
D, [2013/08/15 23:13:45#15449] DEBUG -- rbotconfig.rb:28:in `<module:Config>': trying to load rubygems
D, [2013/08/15 23:13:45#15449] DEBUG -- rbotconfig.rb:35:in `<module:Config>': loaded rubygems, looking for rbot version 0.9.15 (rbot-0.9.15)
NOTE: Gem::SourceIndex#each is deprecated with no replacement. It will be removed on or after 2011-11-01.
Gem::SourceIndex#each called from /usr/lib/ruby/vendor_ruby/rbot/rbotconfig.rb:36.
D, [2013/08/15 23:13:45#15449] DEBUG -- rbotconfig.rb:37:in `<module:Config>': got gem
D, [2013/08/15 23:13:45#15449] DEBUG -- rbotconfig.rb:43:in `<module:Config>': not installed via rubygems
/usr/lib/ruby/vendor_ruby/rbot/load-gettext.rb:74: warning: assigned but unused variable - ret
/usr/lib/ruby/vendor_ruby/gettext/runtime/textdomain_manager.rb:82: warning: assigned but unused variable - msg
/usr/lib/ruby/vendor_ruby/gettext/runtime/mofile.rb:188: warning: assigned but unused variable - i
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:88: warning: `%' after local variable is interpreted as binary operator
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:88: warning: even though it seems like string literal
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:101: warning: assigned but unused variable - search_files
/usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:65:in `%': key{locale} not found (KeyError)
        from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:65:in `block in default_path_rules'
        from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:64:in `select'
        from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:64:in `default_path_rules'
        from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:80:in `block in default_path_rules'
        from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:95:in `block in _memoize_dup'
        from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:87:in `_memoize'
        from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:95:in `_memoize_dup'
        from /usr/lib/ruby/vendor_ruby/locale/util/memoizable.rb:79:in `default_path_rules'
        from /usr/lib/ruby/vendor_ruby/gettext/runtime/locale_path.rb:82:in `initialize'
        from /usr/lib/ruby/vendor_ruby/gettext/runtim...