dockerfile-kasm-core build is not working

[roshvin]

dockerfile-kasm-core build is not working

i am getting below error , could you pls suggest.
docker file used https://github.com/kasmtech/workspaces-core-images/blob/develop/dockerfile-kasm-core

#16 202.6 Processing triggers for systemd (245.4-4ubuntu3.20) ...
#16 202.6 Processing triggers for sgml-base (1.29.1) ...
#16 202.7 Errors were encountered while processing:
#16 202.7  libfprint-2-2:amd64
#16 202.7  fprintd
#16 202.7  libpam-fprintd:amd64
#16 202.7  udisks2
#16 202.7  gvfs-daemons
#16 202.7  gvfs-backends
#16 202.7  gvfs:amd64
#16 202.8 E: Sub-process /usr/bin/dpkg returned an error code (1)
#16 ERROR: process "/bin/sh -c bash $INST_SCRIPTS/xfce/install_xfce_ui.sh && rm -rf $INST_SCRIPTS/xfce/" did not complete successfully: exit code: 100
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 > [12/55] RUN bash /dockerstartup/install/xfce/install_xfce_ui.sh && rm -rf /dockerstartup/install/xfce/:
#16 202.5 Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
#16 202.5 Processing triggers for dbus (1.12.16-2ubuntu2.3) ...
#16 202.6 Processing triggers for systemd (245.4-4ubuntu3.20) ...
#16 202.6 Processing triggers for sgml-base (1.29.1) ...
#16 202.7 Errors were encountered while processing:
#16 202.7  libfprint-2-2:amd64
#16 202.7  fprintd
#16 202.7  libpam-fprintd:amd64
#16 202.7  udisks2
: Sub-process /usr/bin/dpkg returned an error code (1)
------
dockerfile-kasm-core:78
--------------------
  76 |     ### Install xfce UI
  77 |     COPY ./src/ubuntu/install/xfce $INST_SCRIPTS/xfce/
  78 | >>> RUN bash $INST_SCRIPTS/xfce/install_xfce_ui.sh && rm -rf $INST_SCRIPTS/xfce/
  79 |     ADD ./src/$DISTRO/xfce/.config/ $HOME/.config/
  80 |     RUN mkdir -p /usr/share/extra/backgrounds/
--------------------
ERROR: failed to solve: process "/bin/sh -c bash $INST_SCRIPTS/xfce/install_xfce_ui.sh && rm -rf $INST_SCRIPTS/xfce/" did not complete successfully: exit code: 100
Error: Process completed with exit code 1.