$ sudo apt-get build-dep ruby-rvm                                                                                                                                                             [33/1336]
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  debhelper dh-apparmor gettext html2text intltool-debian libgettextpo0 libunistring0 po-debconf
0 upgraded, 8 newly installed, 0 to remove and 0 not upgraded.
Need to get 2,706 kB of archives.
After this operation, 7,741 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://no.archive.ubuntu.com/ubuntu/ precise/main libunistring0 amd64 0.9.3-5 [427 kB]
Get:2 http://no.archive.ubuntu.com/ubuntu/ precise/main libgettextpo0 amd64 0.18.1.1-5ubuntu3 [120 kB]
Get:3 http://no.archive.ubuntu.com/ubuntu/ precise/main html2text amd64 1.3.2a-15 [104 kB]
Get:4 http://no.archive.ubuntu.com/ubuntu/ precise/main gettext amd64 0.18.1.1-5ubuntu3 [1,188 kB]
Get:5 http://no.archive.ubuntu.com/ubuntu/ precise/main intltool-debian all 0.35.0+20060710.1 [31.6 kB]
Get:6 http://no.archive.ubuntu.com/ubuntu/ precise/main po-debconf all 1.0.16+nmu2ubuntu1 [210 kB]
Get:7 http://no.archive.ubuntu.com/ubuntu/ precise-updates/main dh-apparmor all 2.7.102-0ubuntu3.9 [8,950 B]
Get:8 http://no.archive.ubuntu.com/ubuntu/ precise/main debhelper all 9.20120115ubuntu3 [616 kB]
Fetched 2,706 kB in 1s (1,784 kB/s)
Selecting previously unselected package libunistring0:amd64.
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Processing triggers for man-db ...
Processing triggers for install-info ...
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Processing 1 added doc-base file...
Setting up libunistring0:amd64 (0.9.3-5) ...
Setting up libgettextpo0:amd64 (0.18.1.1-5ubuntu3) ...
Setting up html2text (1.3.2a-15) ...
Setting up gettext (0.18.1.1-5ubuntu3) ...
Setting up intltool-debian (0.35.0+20060710.1) ...
Setting up po-debconf (1.0.16+nmu2ubuntu1) ...
Setting up dh-apparmor (2.7.102-0ubuntu3.9) ...
Setting up debhelper (9.20120115ubuntu3) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place


$ sudo apt-get install ruby-rvm
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ruby-rvm : Depends: zlib1g-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.


$ sudo apt-get install zlib1g-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 zlib1g-dev : Depends: zlib1g (= 1:1.2.3.4.dfsg-3ubuntu4) but 1:1.2.7.dfsg-13 is to be installed
E: Unable to correct problems, you have held broken packages.


$ sudo apt-get install zlib1g
Reading package lists... Done
Building dependency tree
Reading state information... Done
zlib1g is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


$ sudo apt-get check
Reading package lists... Done
Building dependency tree
Reading state information... Done