Try with the requirements.txt from the sources

conf/requirements_orig.txt

@@ -0,0 +1,56 @@
+###############################################################################
+#
+# IMPORTANT:
+#
+# If runtime or build time dependencies are changed in this file, the committer
+# *must* ensure the DEB and RPM package maintainers are informed as soon as
+# possible.
+#
+###############################################################################
+
+Flask==2.2.*
+Flask-Gravatar==0.*
+Flask-Login==0.*
+Flask-Mail==0.*
+Flask-Migrate==4.*
+greenlet==1.1.2;  python_version <= '3.10'
+Flask-SQLAlchemy==3.0.*
+Flask-WTF==1.1.1
+Flask-Compress==1.*
+Flask-Paranoid==0.*
+Flask-Babel==3.1.*
+Flask-Security-Too==5.1.*
+Flask-SocketIO==5.3.*
+WTForms==3.0.*
+passlib==1.*
+pytz==2023.*
+speaklater3==1.*
+sqlparse==0.*
+psutil==5.9.*
+psycopg[c]==3.1.9
+python-dateutil==2.*
+SQLAlchemy==2.*
+bcrypt==4.0.*
+cryptography==41.0.*
+sshtunnel==0.*
+ldap3==2.*
+gssapi==1.8.*
+eventlet==0.33.3
+httpagentparser==1.9.*
+user-agents==2.2.0
+pywinpty==2.0.*; sys_platform=="win32"
+Authlib==1.2.*
+pyotp==2.*
+qrcode==7.*
+Pillow==9.*
+boto3==1.28.*
+botocore==1.31.*
+urllib3==1.26.*
+azure-mgmt-rdbms==10.1.0
+azure-mgmt-resource==23.0.1
+azure-mgmt-subscription==3.1.1
+azure-identity==1.13.0
+google-api-python-client==2.*
+google-auth-oauthlib==1.0.0
+Werkzeug==2.2.3
+keyring==23.*

scripts/_common.sh

@@ -42,6 +42,7 @@ ynh_use_venv() {
 _install_pgadmin_pip() {
     # ynh_exec_as "$app" "$venvpy" -m pip install --upgrade --no-cache-dir --ignore-installed "psycopg[c]"
 
-    cp "$YNH_APP_BASEDIR/conf/requirement_$(lsb_release --codename --short).txt" "$install_dir/requirements.txt"
+    # cp "$YNH_APP_BASEDIR/conf/requirement_$(lsb_release --codename --short).txt" "$install_dir/requirements.txt"
+    cp "$YNH_APP_BASEDIR/conf/requirement_orig.txt" "$install_dir/requirements.txt"
     ynh_exec_as "$app" "$venvpy" -m pip install --upgrade -r "$install_dir/requirements.txt"
 }