Re: [PLUG] Optical drive driving me crazy

[Don Buchholz]

On 12/29/2015 8:18 AM, Don Buchholz wrote:
> On 12/29/2015 12:06 AM, Russell Senior wrote:
>>> "johnxj" == johnxj   writes:
>> johnxj> The computer is otherwise running fine. From past experience the
>> johnxj> only way I know to fix this problem is to reboot the
>> johnxj> computer. Please don't tell me I must always reboot the computer
>> johnxj> in order to change an optical medium. :(
>>
>> johnxj> Edit: Now I can't even mount a USB drive. It is at least
>> johnxj> recognized, but attempts to mount it result in:
>>
>> johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
>> johnxj> system."
>>
>> Remove the USB and optical media and in a terminal, run:
>>
>> mount
>>
>> by itself and paste the results.
> "eject  ..." is the terminal command to eject media (optical disks, USB
> sticks, external drives, etc.).  What you type after "eject" will depend
> on the output from the "mount" command that Russell has requested.
> The output of "fdisk" can often be helpful, too ...
Um, that's  "fdisk -l"     (Sorry, a bit of a caffeine deficiency 
still.)

- Don
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Re: [PLUG] Optical drive driving me crazy

[Don Buchholz]

On 12/29/2015 12:06 AM, Russell Senior wrote:
>> "johnxj" == johnxj   writes:
> johnxj> The computer is otherwise running fine. From past experience the
> johnxj> only way I know to fix this problem is to reboot the
> johnxj> computer. Please don't tell me I must always reboot the computer
> johnxj> in order to change an optical medium. :(
>
> johnxj> Edit: Now I can't even mount a USB drive. It is at least
> johnxj> recognized, but attempts to mount it result in:
>
> johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
> johnxj> system."
>
> Remove the USB and optical media and in a terminal, run:
>
>mount
>
> by itself and paste the results.
>
>

"eject  ..." is the terminal command to eject media (optical disks, USB
sticks, external drives, etc.).  What you type after "eject" will depend
on the output from the "mount" command that Russell has requested.
The output of "fdisk" can often be helpful, too ...

- Don
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Re: [PLUG] Optical drive driving me crazy

[King Beowulf]

On Tuesday, December 29, 2015, John Jason Jordan  wrote:

>
>
> If I plug in the USB drive the mount command adds a line:
>
> /dev/sdd1 on /media/jjj/128GB type ext4
> (rw,nosuid,nodev,uhelper=udisks2)
>
> And the drive works perfectly.
>
> However, at this point the optical drive won't mount anything. I tried
> half a dozen different DVDs, the light on the drive flashes briefly,
> then stops. The mount command does not see it, nor is there anything in
> the GUI file manager.
>
> Now I'm worried that there might be a hardware failure
>

John

after reading your post abd all the diagnostics and responses, and mulling
it over for a bit while stuck at an airport, I'm going to have to point out
the elephant in the room: systemd.

If really looks like that is what has borked your udev and hotplug
subsystems.

I don't mean to start a flame war, but this core piece of software is far
from ready for prime time.  To be homest, this udev/hotplug issue was
solved over a decade ago.  It has recently popped up with systemd

In your case, what to do?  Back up your stuff, and reinstall Ubuntu. That
might fix whatever piece flipped out during one of Ubuntu's idiotic
constant updates.

Or switch to a non systemd distro.

-Ed


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Re: [PLUG] Optical drive driving me crazy

[John Jason Jordan]

On Tue, 29 Dec 2015 12:15:03 -0800
Russell Senior  dijo:

>> "John" == John Jason Jordan  writes:
>
>John> On Tue, 29 Dec 2015 00:06:29 -0800 Russell Senior
>John>  dijo:
>
 "johnxj" == johnxj  writes:
>>> 
>johnxj> The computer is otherwise running fine. From past experience
>johnxj> the only way I know to fix this problem is to reboot the
>johnxj> computer. Please don't tell me I must always reboot the
>johnxj> computer in order to change an optical medium. :(
>>> 
>johnxj> Edit: Now I can't even mount a USB drive. It is at least
>johnxj> recognized, but attempts to mount it result in:
>>> 
>johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
>johnxj> system."
>>> 
>>> Remove the USB and optical media and in a terminal, run:
>>> 
>>> mount
>
>Okay, now plug your USB thingie and run the plain "mount" command again
>and look for differences.  Likewise, your optical disk.

If I plug in the USB drive the mount command adds a line:

/dev/sdd1 on /media/jjj/128GB type ext4
(rw,nosuid,nodev,uhelper=udisks2)

And the drive works perfectly.

However, at this point the optical drive won't mount anything. I tried
half a dozen different DVDs, the light on the drive flashes briefly,
then stops. The mount command does not see it, nor is there anything in
the GUI file manager.

Now I'm worried that there might be a hardware failure. 
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Re: [PLUG] Optical drive driving me crazy

[David]

On 12/29/2015 12:15 PM, Russell Senior wrote:
>> "John" == John Jason Jordan  writes:
>
> John> On Tue, 29 Dec 2015 00:06:29 -0800 Russell Senior
> John>  dijo:
>
 "johnxj" == johnxj  writes:
>>>
> johnxj> The computer is otherwise running fine. From past experience the
> johnxj> only way I know to fix this problem is to reboot the
> johnxj> computer. Please don't tell me I must always reboot the computer
> johnxj> in order to change an optical medium. :(
>>>
> johnxj> Edit: Now I can't even mount a USB drive. It is at least
> johnxj> recognized, but attempts to mount it result in:
>>>
> johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
> johnxj> system."
>>>
>>> Remove the USB and optical media and in a terminal, run:
>>>
>>> mount
>
> Okay, now plug your USB thingie and run the plain "mount" command again
> and look for differences.  Likewise, your optical disk.
>
>

It also looks like the error is saying that /media/jjj is read-only at 
this point, and unless I'm reading the mount output from the previous 
email correctly, this would be /dev/sdb1. If this is the case, there may 
be errors on that partition and the filesystem was remounted read only.

What happens if you manually execute "mkdir /media/jjj/test" or "mkdir 
/tmp/test"?

The only way that I know to clear a read only filesystem is to remount 
it (if permitted), or to reboot with a manual fsck on the problem partition.

dafr
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Re: [PLUG] Optical drive driving me crazy

[Russell Senior]

> "John" == John Jason Jordan  writes:

John> On Tue, 29 Dec 2015 00:06:29 -0800 Russell Senior
John>  dijo:

>>> "johnxj" == johnxj  writes:
>> 
johnxj> The computer is otherwise running fine. From past experience the
johnxj> only way I know to fix this problem is to reboot the
johnxj> computer. Please don't tell me I must always reboot the computer
johnxj> in order to change an optical medium. :(
>> 
johnxj> Edit: Now I can't even mount a USB drive. It is at least
johnxj> recognized, but attempts to mount it result in:
>> 
johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
johnxj> system."
>> 
>> Remove the USB and optical media and in a terminal, run:
>> 
>> mount

Okay, now plug your USB thingie and run the plain "mount" command again
and look for differences.  Likewise, your optical disk.


-- 
Russell Senior, President
russ...@personaltelco.net
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Re: [PLUG] Optical drive driving me crazy

[Michael Rasmussen]

On Tue, Dec 29, 2015 at 10:16:42PM -0800, Russell Senior wrote:
> > "John" == John Jason Jordan  writes:
> 
> John> However, at this point the optical drive won't mount anything. I
> John> tried half a dozen different DVDs, the light on the drive flashes
> John> briefly, then stops. The mount command does not see it, nor is
> John> there anything in the GUI file manager.
> 
> John> Now I'm worried that there might be a hardware failure.
> 
> The other thing that is interesting is the last bit of the output from
> dmesg.  Something like:
> 
>   dmesg | tail -n 40
> 
> that will display the last 40 lines of dmesg output.  The value 40 isn't
> super critical.  It should show some indication of detecting the disk,
> or maybe not.
 
That should be run right after inserting the optical disk.

-- 
  Michael Rasmussen, Portland Oregon  
Be Appropriate && Follow Your Curiosity
The more we think of others, the happier we are. 
The more we think of ourselves, the more suffering we feel. 
~ Dalai Lama
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Re: [PLUG] Optical drive driving me crazy

[Russell Senior]

> "John" == John Jason Jordan  writes:

John> However, at this point the optical drive won't mount anything. I
John> tried half a dozen different DVDs, the light on the drive flashes
John> briefly, then stops. The mount command does not see it, nor is
John> there anything in the GUI file manager.

John> Now I'm worried that there might be a hardware failure.

The other thing that is interesting is the last bit of the output from
dmesg.  Something like:

  dmesg | tail -n 40

that will display the last 40 lines of dmesg output.  The value 40 isn't
super critical.  It should show some indication of detecting the disk,
or maybe not.


-- 
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russ...@personaltelco.net
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Re: [PLUG] Optical drive driving me crazy

[Keith]

On 12/26/2015 05:59 PM, John Jason Jordan wrote:
> My laptop has a Bluray drive. When I insert a DVD Xubuntu 14.04.3
> automatically mounts it and usually opens a file browser window in
> Thunar. In so doing it creates a mount point
> in /media/jjj/. The problem is that when the DVD is
> removed, whether by pressing the button on the drive or right-clicking
> on the drive in "Places," the folder  is not deleted. This
> would be annoying enough, but when I insert another DVD, regardless of
> the label on the medium, it mounts it in the same folder. This makes it
> impossible to access any of the files on the second DVD because they
> are not in that folder.
> 
> It is also impossible to delete the folder without manually unmounting
> it from the command line. Attempts to delete it, even as root, return
> "the device is busy," whether there is media in the drive or not.
> 
> I don't recall this ever being a problem in the past. What could have
> gone awry to cause this behavior?
> 
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> 
I'm running Linux Mint 17.3 and have the same effect with my DVD drive.
If I open a CLI terminal and type 'eject' then the folder is removed
from /media/USER/DVD-NAME

HTH.
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Re: [PLUG] Optical drive driving me crazy

[Russell Senior]

> "johnxj" == johnxj   writes:

johnxj> The computer is otherwise running fine. From past experience the
johnxj> only way I know to fix this problem is to reboot the
johnxj> computer. Please don't tell me I must always reboot the computer
johnxj> in order to change an optical medium. :(

johnxj> Edit: Now I can't even mount a USB drive. It is at least
johnxj> recognized, but attempts to mount it result in:

johnxj> "Error creating mount point `/media/jjj/128GB': Read-only file
johnxj> system."

Remove the USB and optical media and in a terminal, run:

  mount

by itself and paste the results.


-- 
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russ...@personaltelco.net
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