В принципе уже видно что директория var у вас подозрительно здоровая. 1,6 Гб
Но лучше убедится окончательно что еще где-то не засело.
Так что sudo du -xkhd 1 /
sudo не работает.
Правильно понимаю, что мне пробовать попасть в папку VAR и посмотреть содержимое ?
F_store> sudo
-sh: sudo: not found
UPD!! Зашел в var и посмотрел, что есть.
F_store> cd /var
F_store> ls -l
drwxr-xr-x 2 root root 4096 Nov 12 2012 db
drwxr-xr-x 2 root root 4096 Nov 12 2012 empty
drwxr-xr-x 4 root root 4096 Oct 6 2016 lib
drwxr-xr-x 3 root root 4096 Mar 4 2013 lock
drwxr-xr-x 5 root root 4096 Nov 9 00:07 log
drwx------ 3 root root 4096 Nov 9 01:06 net-snmp
drwxr-xr-x 9 root root 4096 Nov 8 22:35 packages
drwxr-xr-x 8 root root 4096 Nov 9 02:08 run
drwxr-xr-x 3 root root 4096 Nov 9 00:09 services
drwxr-xr-x 4 root root 4096 Nov 9 02:06 spool
drwxr-xr-x 3 root root 4096 Oct 5 2016 state
lrwxrwxrwx 1 root root 4 Nov 9 00:07 tmp -> /tmp
F_store> du -xkhd 1 /
604.0K /bin
8.0K /volumeUSB1
du: can't open '/var/run/cups/certs': Permission denied
du: can't open '/var/net-snmp': Permission denied
du: can't open '/var/state/ups': Permission denied
du: can't open '/var/log/synolog': Permission denied
1.6G /var
du: can't open '/lost+found': Permission denied
6.4M /.syno
32.0K /.old_patch_info
du: can't open '/var.defaults/state/ups': Permission denied
88.0K /var.defaults
8.0K /root
5.7M /sbin
92.0K /dev
4.0K /mnt
4.2M /etc.defaults
4.0K /initrd
16.0K /.system_info
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/line.png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/progress: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/notifi_middle2.png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/notifi_middle_right. png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/File-Task-Monitor-48 .png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/notifi_bg.png: Permi ssion denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_bgtask.gif: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/notifi_arrow.png: Pe rmission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_download.pn g: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/File-Task-Monitor-16 .png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_upload.gif: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_bgtask.png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/File-Task-Monitor-32 .png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/File-Task-Monitor-24 .png: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/notifi_middle_left.p ng: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_download.gi f: Permission denied
du: /usr/syno/synoman/webman/modules/FileTaskMonitor/images/tray_ico_upload.png: Permission denied
du: can't open '/usr/syno/etc/ssl/ssl.key': Permission denied
du: can't open '/usr/syno/etc/ssl/cgi.key': Permission denied
du: can't open '/usr/share/debsig/keyrings/C42CCD870EBD11E7': Permission denied
279.4M /usr
du: can't open '/etc/space': Permission denied
4.5M /etc
110.9M /lib
2.0G /
F_store>