do you have 'which' installed?
E.g. at the shell prompt one can try something like

$ which tar
and get 

/bin/tar

(or nothing, if you don't have tar)

On Tuesday, 27 October 2015 08:29:52 UTC-7, Alkis Akritas wrote:
>
> I have  SageMath Version 6.8, Release Date: 2015-07-26 installed on my 
> computer (Ubuntu 14.04) 
> and the latest version of TeXmacs installed from subversion.
>
> Separately, they both work fine. However when I try to start sage from 
> TeXmacs I get the message 
>
> python: can't open file '‘which': [Errno 2] No such file or directory
>
> and sage never starts.
>
> From  the terminal I get the message 
>
> TeXmacs] debug-shell, Launching 'sage -python `which tm_sage`'
>
> Is this a sage problem and how can I fix it??
>
> Thanks for your help,
>
> aga
>
>
>

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