The command is:

osc build --nodebugpackages  xUbuntu_20.10 i586

the result :

[  355s] [164/207] installing tex-common-6.15
[  358s] /usr/sbin/update-updmap: line 166: getopt: command not found
[  358s] dpkg: error processing package tex-common (--install):
[  358s]  installed tex-common package post-installation script subprocess returned error exit status 127
[  358s] Processing triggers for man-db (2.9.3-2) ...
[  358s] Errors were encountered while processing:
[  358s]  tex-common
[  358s] exit ...
[  358s]
[  358s] opensuse failed "build guile18.dsc" at Thu Dec  3 15:11:38 UTC 2020.
[  358s]

although there is no problem with the online compilation :

[    1s] lamb04 started "build guile18.dsc" at Thu Dec  3 13:43:28 UTC 2020.
[    1s] 
[    1s] Building Guile18 for project 'home:DenisRx:TeXmacs' repository 'xUbuntu_20.10' arch 'i586' srcmd5 'f9630deebb722ec55687291d0c9e8334'
[    1s] 
[    1s] processing recipe /var/cache/obs/worker/root_3/.build-srcdir/guile18.dsc ...
........................ 

[   71s] [163/207] installing libpython3.8-minimal-3.8.6-1
[   71s] [164/207] installing tex-common-6.15
[   71s] update-language: texlive-base not installed and configured, doing nothing!
[   71s] Processing triggers for man-db (2.9.3-2) ...

and tex-common seems to be included on ubuntu20.10  as it appears in the file

http://ftp.halifax.rwth-aachen.de/ubuntu/ubuntu/dists/groovy/universe/binary-i386/Packages.gz

$ egrep 'Package: *tex-common' -A6 Packages
Package: tex-common
Architecture: all
Version: 6.15
Multi-Arch: foreign
Priority: optional
Section: universe/tex
Origin: Ubuntu

Regards