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I have a usb external hard drive hosting debian testing (listed as sdc and sdc1) and am trying to mount it. Its ext4 and this is the command I use with the resulting error:
root@polaris:~# mount /dev/sdc -t ext4 /mnt/external-drive
mount: wrong fs type, bad option, bad superblock on /dev/sdc,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
BTW- tail syslog shows this:
Nov 3 17:32:09 polaris dbus: [system] Successfully activated service 'org.debian.apt'
Nov 3 17:32:20 polaris kernel: [ 43.390499] EXT4-fs (sdc): VFS: Can't find ext4 filesystem
Nov 3 17:33:10 polaris kernel: [ 92.932351] EXT4-fs (sdc): VFS: Can't find ext4 filesystem
Nov 3 17:33:22 polaris kernel: [ 105.596311] EXT4-fs (sdc1): VFS: Can't find ext4 filesystem
Nov 3 17:34:38 polaris kernel: [ 181.285449] EXT4-fs (sdc): VFS: Can't find ext4 filesystem
Nov 3 17:35:16 polaris wpa_supplicant: wlan0: WPA: Group rekeying completed with 00:1e:e5:7b:d3:b6 [GTK=TKIP]
Nov 3 17:37:59 polaris kernel: [ 381.897704] EXT4-fs (sdc): VFS: Can't find ext4 filesystem
Nov 3 17:38:09 polaris AptDaemon: INFO: Quitting due to inactivity
Nov 3 17:38:09 polaris AptDaemon: INFO: Quitting was requested
Nov 3 17:39:12 polaris kernel: [ 454.295661] EXT4-fs (sdc): VFS: Can't find ext4 filesystem