Since nothing worked, I formatted the disk with TheBrig installation ans started over.
This is what I get :
fetch -o /tmp/thebrig_install.sh
https://github.com/fsbruva/thebrig/raw/ ... install.sh
/tmp/thebrig_install.sh 100% of 4053 B 13 MBps 00m00s
howiserver: /tmp # chmod a+x /tmp/thebrig_install.sh
howiserver: /tmp # /bin/sh /tmp/thebrig_install.sh /mnt/jails/jails 2
Retrieving the testing branch as a zip file
working.zip 100% of 248 kB 479 kBps 00m01s
Unpacking the tarball...
x README
x conf/
x conf/bin/
x conf/bin/change_ver.php
x conf/bin/ftp_amd64
x conf/bin/ftp_i386
x conf/bin/jail.sh
x conf/bin/thebrig_fetch.sh
x conf/bin/thebrig_ports_cron.php
x conf/bin/thebrig_start.php
x conf/bin/thebrig_start.sh
x conf/bin/thebrig_stop.sh
x conf/bin/thebrig_update_cron.php
x conf/ext/
x conf/ext/thebrig/
x conf/ext/thebrig/extensions_thebrig.php
x conf/ext/thebrig/extensions_thebrig_check.php
x conf/ext/thebrig/extensions_thebrig_config.php
x conf/ext/thebrig/extensions_thebrig_download.php
x conf/ext/thebrig/extensions_thebrig_edit.php
x conf/ext/thebrig/extensions_thebrig_fstab.php
x conf/ext/thebrig/extensions_thebrig_log.php
x conf/ext/thebrig/extensions_thebrig_manager.php
x conf/ext/thebrig/extensions_thebrig_ports.php
x conf/ext/thebrig/extensions_thebrig_tarballs.php
x conf/ext/thebrig/extensions_thebrig_tools.php
x conf/ext/thebrig/extensions_thebrig_update.php
x conf/ext/thebrig/fstab.png
x conf/ext/thebrig/functions.inc
x conf/ext/thebrig/lang.inc
x conf/ext/thebrig/menu.inc
x conf/ext/thebrig/off_small.png
x conf/ext/thebrig/on_small.png
x conf/freebsd-update.conf
x conf/freebsd-update_thin.conf
x conf/make.conf
x conf/periodic.conf
x conf/portsnap.conf
x conf/sbin/
x conf/sbin/freebsd-update
x conf/sbin/portsnap
x thebrig_install.sh
No need updates
You use fresh version
After that the installation dir is empty ( besides a logfile telling me about a successful installation )
I am lost.