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[M Conrad <1875909@xxxxxxxxxxxxxxxxxx>]

I have narrowed this down to having UTF-8 characters in the path where
the document is stored.

This is a new issue for me. I have for years been using this folder
structure with the UTF-8 name of "ᏣᎳᎩ".

What is really perplexing is the fact that LyX copies all the necessary
files to run the xelatex to a temp folder in /tmp, then the xelatex
fails. If I run xelatex in that same temp folder with those same files,
the xelatex command completes successfully.

It is acting like some python thingy is assuming that things are encoded
as iso-8859-1 or something?

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https://bugs.launchpad.net/bugs/1875909

Title:
  LyX can't build PDFs / missing begin document

Status in lyx package in Ubuntu:
  New

Bug description:
  Reconfigure results in:

  ```
  Traceback (most recent call last):
    File "/usr/share/lyx/configure.py", line 1899, in <module>
      ret = checkLatexConfig(lyx_check_config and LATEX, bool_docbook)
    File "/usr/share/lyx/configure.py", line 1420, in checkLatexConfig
      for line in open(file, 'r', encoding='utf8').readlines():
    File "/usr/lib/python3.8/codecs.py", line 322, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa9 in position 845: invalid start byte
  support/Systemcall.cpp (276): Systemcall: 'python3 -tt "/usr/share/lyx/configure.py" --binary-dir="/usr/bin/"' finished with exit code 1

  ```

  Running 'python3 -tt "/usr/share/lyx/configure.py" --binary-
  dir="/usr/bin/"' in a terminal does *not* result in the error LyX is
  reporting and instead appears to complete successfully.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: lyx 2.3.4.2-2
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Wed Apr 29 10:50:55 2020
  InstallationDate: Installed on 2014-05-08 (2182 days ago)
  InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
  SourcePackage: lyx
  UpgradeStatus: Upgraded to focal on 2020-04-25 (4 days ago)

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