I can confirm the bug:

Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\includeonly{ <-- HERE (.*?)}/ at /usr/bin/latexdiff line 1572.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/(^(?:[^%\n]|\\%)*)\\bibliography{ <-- HERE (.*?)}/ at 
/usr/bin/latexdiff line 1607.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/(^(?:[^%\n]|\\%)*)\\subfile{ <-- HERE (.*?)}/ at 
/usr/bin/latexdiff line 1622.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/(?<!\\)\\{ <-- HERE / at /usr/bin/latexdiff line 2351.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\begin{ <-- HERE 
MATHMODE}((?:(.(?!(?<!\\)\&|\\\\))*)?)\\end{MATHMODE}/ at /usr/bin/latexdiff 
line 2676.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\begin{MATHMODE}((?:(.(?!(?<!\\)\&|\\\\))*)?)\\end{ <-- HERE 
MATHMODE}/ at /usr/bin/latexdiff line 2676.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\begin{ <-- HERE MATHMODE}(.*?)\\end{MATHMODE}/ at 
/usr/bin/latexdiff line 2678.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\begin{MATHMODE}(.*?)\\end{ <-- HERE MATHMODE}/ at 
/usr/bin/latexdiff line 2678.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\end{ <-- HERE SQUAREBRACKET}/ at /usr/bin/latexdiff line 2759.
Unescaped left brace in regex is deprecated, passed through in regex; marked by 
<-- HERE in m/\\begin{ <-- HERE SQUAREBRACKET}/ at /usr/bin/latexdiff line 2760.
This is LATEXDIFF 1.1.1  (Algorithm::Diff 1.15 fast, Perl v5.22.1)
  (c) 2004-2015 F J Tilmann


Looks like this has been fixed: https://github.com/ftilmann/latexdiff/issues/43

Just needs to be included into Ubuntu 16.04.

** Bug watch added: github.com/ftilmann/latexdiff/issues #43
   https://github.com/ftilmann/latexdiff/issues/43

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https://bugs.launchpad.net/bugs/1600266

Title:
  Unescaped left brace in regex

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