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+see also: \
+https://computingforgeeks.com/install-postgresql-12-on-ubuntu/
+
+`wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -`
+response:\
+OK
+
+`echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" |sudo tee  /etc/apt/sources.list.d/pgdg.list`
+response: \
+deb http://apt.postgresql.org/pub/repos/apt/ focal-pgdg main \
+
+(dieses Repository hat aktuellere postgres 12 Versionen, deswegen upgraden: \
+```
+sudo apt update
+sudo apt list --upgradable
+sudo apt update
+```
+
+`sudo apt install postgresql postgresql-contrib`
+> the following additional packages will be installed:
+>   libcommon-sense-perl libjson-perl libjson-xs-perl libllvm9 libtypes-serialiser-perl pgdg-keyring
+>   postgresql-13 postgresql-client-13 postgresql-client-common postgresql-common sysstat
+> Suggested packages:
+>   postgresql-doc postgresql-doc-13 isag
+> The following NEW packages will be installed:
+>   libcommon-sense-perl libjson-perl libjson-xs-perl libllvm9 libtypes-serialiser-perl pgdg-keyring postgresql
+>   postgresql-13 postgresql-client-13 postgresql-client-common postgresql-common postgresql-contrib sysstat
+> 0 upgraded, 13 newly installed, 0 to remove and 0 not upgraded.
+> Need to get 32.5 MB of archives.
+> After this operation, 128 MB of additional disk space will be used.
+
+response: \
+the database cluster will be initialized with locale "en_US.UTF-8". \
+The default database encoding has accordingly been set to "UTF8". \
+The default text search configuration will be set to "english". \
+
+Data page checksums are disabled. \
+
+fixing permissions on existing directory /var/lib/postgresql/13/main ... ok \
+creating subdirectories ... ok \
+selecting dynamic shared memory implementation ... posix \
+selecting default max_connections ... 100 \
+selecting default shared_buffers ... 128MB \
+selecting default time zone ... Etc/UTC \
+creating configuration files ... ok \
+running bootstrap script ... ok \
+performing post-bootstrap initialization ... ok \
+syncing data to disk ... ok \
+
+Success. You can now start the database server using: \
+
+    pg_ctlcluster 13 main start \
+    
+ 
+