Use different texlive installation

[Zelphir Kaltstahl]

Hello LyX users!

I've searched the mailing list archives and found some instructions on
how to change the texlive installation, which LyX uses and added the
following to my `.profile`:

~~~~START~~~~
###################
# texlive manager #
###################
export MY_TEXLIVE_LOCATION="/usr/local/texlive"
export PATH="${MY_TEXLIVE_LOCATION}/2019/bin/x86_64-linux:${PATH}"

#######
# LYX #
#######

# LYX must know where texlive is installed, otherwise it will have limited functionality.
# prepend web2c path
export TEXMFCNF="${MY_TEXLIVE_LOCATION}/2019/texmf-dist/web2c" # ":${TEXMFCNF}"
# export MANPATH="${MY_TEXLIVE_LOCATION}/2019/texmf-dist/doc/man:${MANPATH}"
# export INFOPATH="${MY_TEXLIVE_LOCATION}/2019/texmf-dist/doc/info:${INFOPATH}"
~~~~~END~~~~~

And it worked great for a day, I got lots of writing done. Then the next
day I restarted my machine and LyX complained about not finding any
textclasses and that it would have limitations.

Whenever I hit Tools > Reconfigure, I get an error on command line output:

~~~~START~~~~
+checking list of textclasses... 
Traceback (most recent call last):
  File "/gnu/store/an9kb3hqk8368b05g39fz4bzrz18khp7-lyx-2.3.3/lyx2.3/share/lyx2.3/configure.py", line 1897, in <module>
    ret = checkLatexConfig(lyx_check_config and LATEX != '', bool_docbook)
  File "/gnu/store/an9kb3hqk8368b05g39fz4bzrz18khp7-lyx-2.3.3/lyx2.3/share/lyx2.3/configure.py", line 1380, in checkLatexConfig
    retval = processLayoutFile(file, bool_docbook)
  File "/gnu/store/an9kb3hqk8368b05g39fz4bzrz18khp7-lyx-2.3.3/lyx2.3/share/lyx2.3/configure.py", line 1327, in processLayoutFile
    classdeclaration = (b'"%s" "%s" "%s" "%s" "%s"'
TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not 'str'
support/Systemcall.cpp (276): Systemcall: '/usr/local/bin/python -tt "/gnu/store/an9kb3hqk8368b05g39fz4bzrz18khp7-lyx-2.3.3/lyx2.3/share/lyx2.3/configure.py" --with-version-suffix=2.3 --binary-dir="/home/xiaolong/.guix-profile/bin/"' finished with exit code 1
~~~~~END~~~~~

It seems like an implementation bug in the script, expecting another
type. I think it could also be Python 2 str VS Python 3 str related.

When I go to Tools > TeX Information, the paths all point to my Guix
profile, instead of the path I defined in the TEXMFCNF environment
variable in my `.profile`. I think that is the reason, why it cannot
find much there. I did not install texlive using Guix, but installed it
by downloading it and installing every single package of the 2019
version using the default installer, which I think in turn uses tlmgr.

My PATH variable starts as follows:

~~~~START~~~~
/home/xiaolong/.nvm/versions/node/v13.9.0/bin:/usr/local/texlive/2019/bin/x86_64-linux: ...
~~~~~END~~~~~

So it is definitely on the path. According to
https://tex.stackexchange.com/questions/454513/how-to-specify-the-path-to-texlive-in-lyx/454523#454523
that should be sufficient, but obviously it is not. It also does not ask
me after a while to restart it or anything, after rescanning in Tools >
TeX Information.

Here is some more system information:

~~~~START~~~~
xiaolong at xlx200:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Trisquel
Description:	Trisquel GNU/Linux 8.0, Flidas
Release:	8.0
Codename:	flidas

xiaolong at xlx200:~$ which lyx2.3 
/home/xiaolong/.guix-profile/bin/lyx2.3

xiaolong at xlx200:~$ which python
/usr/local/bin/python

xiaolong at xlx200:~$ which tlmgr
/usr/local/texlive/2019/bin/x86_64-linux/tlmgr

xiaolong at xlx200:~$ which latexmk
/usr/local/texlive/2019/bin/x86_64-linux/latexmk
~~~~~END~~~~~

Here is a complete log of the output on command line, when I run
`lyx2.3` (it even says, that it will use a wrong texlive):

https://paste.debian.net/1136648/

So at some point my LyX did look at the correct path, but not it is not
and I need to fix it.

What can I do to make LyX pick up the correct texlive installation path?

Best regards,
Zelphir

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