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[Jean-Marc Lasgouttes <1875909@xxxxxxxxxxxxxxxxxx>]

As far as I understand, what you are seeing is upstream ticket #11736, that will be fixed in 2.3.5. For more details, see
https://www.lyx.org/trac/ticket/11736

** Bug watch added: www.lyx.org/trac/ #11736
   http://www.lyx.org/trac/ticket/11736

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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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