virtualbox.org

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mount: wrong fs type, bad option, bad superblock on VmShare,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

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dmesg | tail 

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[   11.008314] intel8x0: measured clock 137471 rejected
[   11.368578] intel8x0_measure_ac97_clock: measured 56214 usecs (7200 samples)
[   11.368585] intel8x0: measured clock 128081 rejected
[   11.368589] intel8x0: clocking to 48000
[   11.394619] systemd-udevd[382]: '/usr/sbin/alsactl -E HOME=/var/run/alsa restore 0' [842] terminated by signal 75 (Unknown signal 75)
[   11.803416] vboxsf: Successfully loaded version 4.3.10 (interface 0x00010004)
[   11.934593] init: udev-fallback-graphics main process (880) terminated with status 1
[   12.936702] init: plymouth-upstart-bridge main process ended, respawning
[   14.814743] init: plymouth-stop pre-start process (1306) terminated with status 1
[   63.400387] sf_read_super_aux err=-22

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sudo adduser user vboxsf