Install docbook2odf by entering the following commands in the terminal:
sudo apt update sudo apt install docbook2odf
Description:
XSLT based conversions from docbook to Oasis Open Document (openoffice.org)
toolkit that automatically converts DocBook to OASIS OpenDocument (ODF, the ISO standardized format used for texts, spreadsheets and presentations). Conversion is based on a XSLT which makes it easy to convert DocBook->ODF, ODT, ODS and ODP as all these documents are XML based.
Version: 0.244-1.1ubuntu1
Section: universe/text