diff --git a/docker/Dockerfile-ubuntu-2204 b/docker/Dockerfile-ubuntu-2204
index 94107d4..530bcc6 100644
--- a/docker/Dockerfile-ubuntu-2204
+++ b/docker/Dockerfile-ubuntu-2204
@@ -15,7 +15,8 @@ ENV PGPASS=""
 ARG GITHUB_PAT
 
 # xvfb: for graphical pkgs requiring tcl, like gWidgets2tcltk
-RUN apt update && apt install -y --no-install-recommends gdebi-core g++ gfortran libbz2-dev libblas-dev libicu-dev liblapack-dev liblzma-dev libpaper-utils libpcre2-dev libtcl8.6 libtk8.6 libxt6 unzip zip zlib1g-dev libpcre3-dev libopenblas-dev curl ca-certificates make ccache htop libgit2-dev git libpq-dev libxml2-dev libgit2-dev cmake xvfb libcurl4-openssl-dev xz-utils
+# tcl tk tk-dev tk-table: must be available before running xvfb-run (i.e. starting the graphical session)
+RUN apt update && apt install -y --no-install-recommends gdebi-core g++ gfortran libbz2-dev libblas-dev libicu-dev liblapack-dev liblzma-dev libpaper-utils libpcre2-dev libtcl8.6 libtk8.6 libxt6 unzip zip zlib1g-dev libpcre3-dev libopenblas-dev curl ca-certificates make ccache htop libgit2-dev git libpq-dev libxml2-dev libgit2-dev cmake xvfb libcurl4-openssl-dev xz-utils tcl tk tk-dev tk-table
 
 ### CUSTOM DEPENDENCIES 
 # These usually are not packaged in OS repositories and need to be installed from source
diff --git a/docker/Dockerfile-ubuntu-2404 b/docker/Dockerfile-ubuntu-2404
index fcbedac..d7f89ec 100644
--- a/docker/Dockerfile-ubuntu-2404
+++ b/docker/Dockerfile-ubuntu-2404
@@ -15,7 +15,8 @@ ENV PGPASS=""
 ARG GITHUB_PAT
 
 # xvfb: for graphical pkgs requiring tcl, like gWidgets2tcltk
-RUN apt update && apt install -y --no-install-recommends gdebi-core g++ gfortran libbz2-dev libblas-dev libicu-dev liblapack-dev liblzma-dev libpaper-utils libpcre2-dev libtcl8.6 libtk8.6 libxt6 unzip zip zlib1g-dev libpcre3-dev libopenblas-dev curl ca-certificates make ccache htop libgit2-dev git libpq-dev libxml2-dev libgit2-dev cmake xvfb libcurl4-openssl-dev xz-utils
+# tcl tk tk-dev tk-table: must be available before running xvfb-run (i.e. starting the graphical session)
+RUN apt update && apt install -y --no-install-recommends gdebi-core g++ gfortran libbz2-dev libblas-dev libicu-dev liblapack-dev liblzma-dev libpaper-utils libpcre2-dev libtcl8.6 libtk8.6 libxt6 unzip zip zlib1g-dev libpcre3-dev libopenblas-dev curl ca-certificates make ccache htop libgit2-dev git libpq-dev libxml2-dev libgit2-dev cmake xvfb libcurl4-openssl-dev xz-utils tcl tk tk-dev tk-table
 
 ### CUSTOM DEPENDENCIES 
 # These usually are not packaged in OS repositories and need to be installed from source