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Shared folders not mounting in Virtual Box


Error mounting VirtualBox shared folders in an Ubuntu guestCan't open shared folders on a virtual boxSharing folders between Windows 8 as host and Ubuntu 13.10 as guest in Virtualboxcan't mount shared folder in Ubuntu guest : vboxsf failed with the error : no such deviceVirtualBox Sharing Folders with Windows 10 Guest and Ubuntu HostVirtual box not install on UBUNTU 16/18 with i686 cpu






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In the space of one hour, having shutdown a virtualBox Ubuntu guest on OSX host, then re-starting it, the shared folders no longer appear on the guest's desktop.



Both still are listed in Virtual Box 6.0.4 's list of shared folders with auto-mount and Make permanent options selected



Calling the directory returns in Terminal returns



bash: cd: /media/sf_r/: Permission denied


I have re-installed Guest Additions as suggested here to no avail.



Permissions on the host folders have no been touched in the meantime. I fail to see the source of this 'flakiness'



What needs to be done to fix this issue?



Updates

When trying to re-install Guest additions from command line, the following error appeared (it had not previously)



VirtualBox Guest Additions: modprobe vboxsf failed


log entry tail is as follows



/tmp/vbox.0/vfsmod.c: In function ‘sf_read_super_aux’:
/tmp/vbox.0/vfsmod.c:235:14: error: ‘MS_REMOUNT’ undeclared (first use in this function); did you mean ‘DT_RELCOUNT’?
if (flags & MS_REMOUNT) {
^~~~~~~~~~
DT_RELCOUNT
/tmp/vbox.0/vfsmod.c:235:14: note: each undeclared identifier is reported only once for each function it appears in
scripts/Makefile.build:284: recipe for target '/tmp/vbox.0/vfsmod.o' failed
make[2]: *** [/tmp/vbox.0/vfsmod.o] Error 1
Makefile:1606: recipe for target '_module_/tmp/vbox.0' failed
make[1]: *** [_module_/tmp/vbox.0] Error 2
/tmp/vbox.0/Makefile.include.footer:106: recipe for target 'vboxsf' failed
make: *** [vboxsf] Error 2


whereas from Host Devices > Insert Guest Additions CD Image returns this error:



Could not mount the media/drive '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).









share|improve this question


































    0

















    In the space of one hour, having shutdown a virtualBox Ubuntu guest on OSX host, then re-starting it, the shared folders no longer appear on the guest's desktop.



    Both still are listed in Virtual Box 6.0.4 's list of shared folders with auto-mount and Make permanent options selected



    Calling the directory returns in Terminal returns



    bash: cd: /media/sf_r/: Permission denied


    I have re-installed Guest Additions as suggested here to no avail.



    Permissions on the host folders have no been touched in the meantime. I fail to see the source of this 'flakiness'



    What needs to be done to fix this issue?



    Updates

    When trying to re-install Guest additions from command line, the following error appeared (it had not previously)



    VirtualBox Guest Additions: modprobe vboxsf failed


    log entry tail is as follows



    /tmp/vbox.0/vfsmod.c: In function ‘sf_read_super_aux’:
    /tmp/vbox.0/vfsmod.c:235:14: error: ‘MS_REMOUNT’ undeclared (first use in this function); did you mean ‘DT_RELCOUNT’?
    if (flags & MS_REMOUNT) {
    ^~~~~~~~~~
    DT_RELCOUNT
    /tmp/vbox.0/vfsmod.c:235:14: note: each undeclared identifier is reported only once for each function it appears in
    scripts/Makefile.build:284: recipe for target '/tmp/vbox.0/vfsmod.o' failed
    make[2]: *** [/tmp/vbox.0/vfsmod.o] Error 1
    Makefile:1606: recipe for target '_module_/tmp/vbox.0' failed
    make[1]: *** [_module_/tmp/vbox.0] Error 2
    /tmp/vbox.0/Makefile.include.footer:106: recipe for target 'vboxsf' failed
    make: *** [vboxsf] Error 2


    whereas from Host Devices > Insert Guest Additions CD Image returns this error:



    Could not mount the media/drive '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).









    share|improve this question






























      0












      0








      0








      In the space of one hour, having shutdown a virtualBox Ubuntu guest on OSX host, then re-starting it, the shared folders no longer appear on the guest's desktop.



      Both still are listed in Virtual Box 6.0.4 's list of shared folders with auto-mount and Make permanent options selected



      Calling the directory returns in Terminal returns



      bash: cd: /media/sf_r/: Permission denied


      I have re-installed Guest Additions as suggested here to no avail.



      Permissions on the host folders have no been touched in the meantime. I fail to see the source of this 'flakiness'



      What needs to be done to fix this issue?



      Updates

      When trying to re-install Guest additions from command line, the following error appeared (it had not previously)



      VirtualBox Guest Additions: modprobe vboxsf failed


      log entry tail is as follows



      /tmp/vbox.0/vfsmod.c: In function ‘sf_read_super_aux’:
      /tmp/vbox.0/vfsmod.c:235:14: error: ‘MS_REMOUNT’ undeclared (first use in this function); did you mean ‘DT_RELCOUNT’?
      if (flags & MS_REMOUNT) {
      ^~~~~~~~~~
      DT_RELCOUNT
      /tmp/vbox.0/vfsmod.c:235:14: note: each undeclared identifier is reported only once for each function it appears in
      scripts/Makefile.build:284: recipe for target '/tmp/vbox.0/vfsmod.o' failed
      make[2]: *** [/tmp/vbox.0/vfsmod.o] Error 1
      Makefile:1606: recipe for target '_module_/tmp/vbox.0' failed
      make[1]: *** [_module_/tmp/vbox.0] Error 2
      /tmp/vbox.0/Makefile.include.footer:106: recipe for target 'vboxsf' failed
      make: *** [vboxsf] Error 2


      whereas from Host Devices > Insert Guest Additions CD Image returns this error:



      Could not mount the media/drive '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).









      share|improve this question

















      In the space of one hour, having shutdown a virtualBox Ubuntu guest on OSX host, then re-starting it, the shared folders no longer appear on the guest's desktop.



      Both still are listed in Virtual Box 6.0.4 's list of shared folders with auto-mount and Make permanent options selected



      Calling the directory returns in Terminal returns



      bash: cd: /media/sf_r/: Permission denied


      I have re-installed Guest Additions as suggested here to no avail.



      Permissions on the host folders have no been touched in the meantime. I fail to see the source of this 'flakiness'



      What needs to be done to fix this issue?



      Updates

      When trying to re-install Guest additions from command line, the following error appeared (it had not previously)



      VirtualBox Guest Additions: modprobe vboxsf failed


      log entry tail is as follows



      /tmp/vbox.0/vfsmod.c: In function ‘sf_read_super_aux’:
      /tmp/vbox.0/vfsmod.c:235:14: error: ‘MS_REMOUNT’ undeclared (first use in this function); did you mean ‘DT_RELCOUNT’?
      if (flags & MS_REMOUNT) {
      ^~~~~~~~~~
      DT_RELCOUNT
      /tmp/vbox.0/vfsmod.c:235:14: note: each undeclared identifier is reported only once for each function it appears in
      scripts/Makefile.build:284: recipe for target '/tmp/vbox.0/vfsmod.o' failed
      make[2]: *** [/tmp/vbox.0/vfsmod.o] Error 1
      Makefile:1606: recipe for target '_module_/tmp/vbox.0' failed
      make[1]: *** [_module_/tmp/vbox.0] Error 2
      /tmp/vbox.0/Makefile.include.footer:106: recipe for target 'vboxsf' failed
      make: *** [vboxsf] Error 2


      whereas from Host Devices > Insert Guest Additions CD Image returns this error:



      Could not mount the media/drive '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).






      18.04 virtualbox macosx






      share|improve this question
















      share|improve this question













      share|improve this question




      share|improve this question








      edited Aug 3 at 17:28







      Jerome

















      asked Aug 3 at 15:09









      JeromeJerome

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