pour premier point:
dan@boby:~$ df -h
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
/dev/sda7 51G 4,4G 47G 9% /
udev 10M 0 10M 0% /dev
tmpfs 1,2G 9,1M 1,2G 1% /run
tmpfs 3,0G 68K 3,0G 1% /dev/shm
tmpfs 5,0M 4,0K 5,0M 1% /run/lock
tmpfs 3,0G 0 3,0G 0% /sys/fs/cgroup
tmpfs 599M 4,0K 599M 1% /run/user/113
tmpfs 599M 12K 599M 1% /run/user/1000
/dev/sda6 54G 1,7G 53G 4% /media/dan/735E1C35386FDC13
/dev/sda3 59G 5,0G 54G 9% /media/dan/DATA
/dev/sda9 30G 15G 14G 51% /mnt
/dev/sda5 30G 141M 30G 1% /media/dan/611F430E3C51CF2B
/dev/sda2 229G 69G 160G 30% /media/dan/ACER
et ensuite:
dan@boby:~$ cat /mnt/etc/systemd/journald.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See journald.conf(5) for details.
[Journal]
#Storage=auto
#Compress=yes
#Seal=yes
#SplitMode=uid
#SyncIntervalSec=5m
#RateLimitIntervalSec=30s
#RateLimitBurst=10000
#SystemMaxUse=
#SystemKeepFree=
#SystemMaxFileSize=
#SystemMaxFiles=100
#RuntimeMaxUse=
#RuntimeKeepFree=
#RuntimeMaxFileSize=
#RuntimeMaxFiles=100
#MaxRetentionSec=
#MaxFileSec=1month
#ForwardToSyslog=yes
#ForwardToKMsg=no
#ForwardToConsole=no
#ForwardToWall=yes
#TTYPath=/dev/console
#MaxLevelStore=debug
#MaxLevelSyslog=debug
#MaxLevelKMsg=notice
#MaxLevelConsole=info
#MaxLevelWall=emerg
#LineMax=48K
#ReadKMsg=yes
voilà, merci