Can't find module lie_algebras

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It is unexpected. How did you install Sage ? Could you please give us some informations so that someone can try to reproduce your problem:

• which version of Sage did you use ?
• which OS ?
• did you install Sage from the binaries, and which ones ?
• did you compile Sage yourself ?
• which notebook did you use (Sage notebook or jupyter notebook) ?
• did you use the command line ?
• which commands did you type precisely to get the error ?
• which error message did you get ?
• ... ?

In the title of the question the b and e in algebra are switched; you didn't do the same mistake when coding by any chance?

Thanks. No, it doesn't seem that way. I just typed the title of the question in a hurry. I am running Sage Notebook on a local host and it is supposed to be version 7.5.1. Might I need a rebuild?

I am running Ubuntu 18.04 and here is a screenshot https://drive.google.com/file/d/1SV64jjAl3g6HQgg1-nKL94Nn1yTMXwjM/view?usp=sharing (link_text). I installed Sage from the Ubuntu Gnome software center which says that it is a pre-built binary for Ubuntu 14.04 (Sage ver. 7.5.1~aimsppa6).

I guess I just wanted to know if this was a known previous issue.