我正在尝试安装维也纳RNA包适用于 Ubuntu 17.10。我遵循以下说明：
sudo apt-add-repository ppa:j-4/vienna-rna
sudo apt-get update
sudo apt-get install vienna-rna
我得到：
Package vienna-rna is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
viennarna:i386 viennarna
所以我尝试：
sudo apt-get install viennarna
我得到：
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:
viennarna : Depends: libgsl0ldbl but it is not installable or
libgsl2 but it is not installable
E: Unable to correct problems, you have held broken packages.
我该如何安装libgsl0ldbl，libgsl2因为我无法使用它apt-get install？