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env: bash\r: No such file or directory

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The error message suggests that the script you’re invoking has embedded <code>\r</code> characters, which in turn suggests that it has Windows-style <code>\r\n</code> line endings (newlines) instead of the <code>\n</code>-only line endings <code>bash</code> expects.
As a quick fix, vous pouvez remove the <code>\r</code> chars. as follows:
<pre><code class="lang-auto">sed $'s/\r$//' ./install.sh > ./install.Unix.sh

</code></pre>
Note: The <code>$'...'</code> string is an <a href="http://www.gnu.org/software/bash/manual/bash.html#ANSI_002dC-Quoting">ANSI-C quoted string</a> supported in <code>bash</code>, <code>ksh</code>, and <code>zsh</code>. It is used to ensure that the <code>\r</code> expands to an actual CR character before <code>sed</code> sees the script, because not all <code>sed</code> implementations themselves support <code>\r</code> as an escape sequence.
puis run
<pre><code class="lang-auto">./install.Unix.sh --clang-completer

</code></pre>
Cependant, the larger question is why you’ve ended up with <code>\r\n</code>-style files - most likely, other files are affected, too.
Perhaps you’re running Git on Windows, where a typical configuration is to convert Unix-style <code>\n</code>-only line breaks to Windows-style <code>\r\n</code> line breaks on checking files out and re-converting to <code>\n</code>-only line breaks on committing.
While this somewhat makes sense for development[1] on Windows, it gets in the way of installation scenarios like these.
To make Git check out files with Unix-style file endings on Windows - at least temporarily - use:
<pre><code class="lang-auto">git config --global core.autocrlf false

</code></pre>
Then run your installation commands involving <code>git clone</code> again.
To restore Git’s behavior later, run <code>git config --global core.autocrlf true</code>.
[1] These days, most editors and CLIs on Windows can handle <code>\r\n</code> and <code>\n</code> newlines interchangeably.