Under Linux BUG series: under ubuntu16.04 U disk becomes read-only Read-Only
Sometimes the use of U disk found it impossible to write multiple plug invalid under ubuntu16.04, but obviously in Win Upan used properly ah. .
repair
Excuting an order
tail -f /var/log/syslog
You can see the U disk into a message in the system log
Jul 16 15:18:22 lowfree02 gnome-session[1701]: (nautilus:3868): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed
Jul 16 15:18:22 lowfree02 gnome-session[1701]: (nautilus:3868): GLib-GObject-WARNING **: invalid (NULL) pointer instance
Jul 16 15:18:22 lowfree02 gnome-session[1701]: (nautilus:3868): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Jul 16 15:18:22 lowfree02 dbus[697]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
Jul 16 15:18:22 lowfree02 systemd[1]: Starting Hostname Service...
Jul 16 15:18:22 lowfree02 dbus[697]: [system] Successfully activated service 'org.freedesktop.hostname1'
Jul 16 15:18:22 lowfree02 systemd[1]: Started Hostname Service.
Jul 16 15:18:23 lowfree02 org.gnome.Nautilus[1547]: (nautilus:3676): GLib-GIO-CRITICAL **: g_file_get_parse_name: assertion 'G_IS_FILE (file)' failed
Jul 16 15:18:23 lowfree02 kernel: [23859.535467] FAT-fs (sdb4): error, corrupted directory (invalid entries)
Jul 16 15:18:23 lowfree02 kernel: [23859.535471] FAT-fs (sdb4): Filesystem has been set read-only
See from the last line:
Jul 16 15:18:23 lowfree02 kernel: [23859.535471] FAT-fs (sdb4): Filesystem has been set read-only
Write down the U disk drive sdb4
addition to know the name of their own to mount U disk, usually under / media can be seen, then umount
# ls /media
lowfree
# umount /media/lowfree/Ubuntu\ 16.0/
Then fix it
# sudo dosfsck -v -a /dev/sdb4
Finally remount or re-plug it to ~
