For Ubuntu 18.04 you have several choices including
- aptitude: apt install sagemath-jupyter
- conda: conda install sagemath
- binary: download from
http://www.sagemath.org/download-linux.html
then pick mirror, pick 64-bit, pick Sage 8.7 Ubuntu 18.04
- build from source
Using the binary from the SageMath download page will
let you install extra packages, so you don't have to build
from source.
See
http://doc.sagemath.org/html/en/installation/
for the prerequisites; there are some prerequisites for using
SageMath installed from a binary, and more prerequisites if
you want to build from source, the details are at
http://doc.sagemath.org/html/en/installation/binary.html
http://doc.sagemath.org/html/en/installation/source.html
Also, can you say more about the optional package you are
trying to install? Is it one of those listed at
http://files.sagemath.org/spkg/upstream/
or is it online somewhere, or is it one you made yourself?
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