Unable to write to new partitions

[Bret Busby]

On 17/03/2018, Bret Busby <bret.busby at gmail.com> wrote:
> On 17/03/2018, Colin Watson <cjwatson at ubuntu.com> wrote:
>> On Sat, Mar 17, 2018 at 09:34:16PM +0800, Bret Busby wrote:
>>> I shrank the boot partitions of teo installed operating systems, and,
>>> for each thence created unallocated space, I created a new sext4
>>> partition, to which, I assigned the respective labels Data05 and
>>> Data06.
>>>
>>> I then, from within my UbuntuMATE 16.04 installation, ran sudo chmod
>>> 777 on each new partition, so as to enable read+write access to the
>>> two partitions.
>>>
>>> But, I can not write to the two partitions.
>>>
>>> What do I need to further do, to these partitions, to enable read+write
>>> access?
>>>
>>> "
>>> ls -l /dev/sda18
>>> brw-rw---- 1 root disk 259, 2 Mar 17 20:50 /dev/sda18
>>> bret at bret-Aspire-V3-772-UbuntuMATE:~$ sudo chmod 777 /dev/sda18
>>
>> This is dangerous and you should undo it as soon as possible ("sudo
>> chmod 660 /dev/sda18 /dev/sda19").  Otherwise-unprivileged processes on
>> your system don't need the ability to write to the *device nodes*.
>>
>
> Done. Did not solve problem. Paste still greyed out when trying to
> Cut/Copy -> Paste. Used chmod 666 and Paste now not greyed out, but
> now I get the error \
> "
> Error while copying "LiveLongAndProspurr.png".
> There was an error copying the file into /media/bret/Data05.
> Error opening file '/media/bret/Data05/LiveLongAndProspurr.png':
> Permission denied
> "
>
>> I suspect what you wanted to do was to modify the permissions on the
>> *mount points* instead.  What does "ls -ld /media/bret/Data05
>> /media/bret/Data06" say?
>>
>
> None of the mounted (as previously described) Dataxx partitions are
> displayed;
>
> "
> bret at bret-Aspire-V3-772-UbuntuMATE:~$ ls -ld /media/bret/Data05
> /media/bret/Data06
> drw-rw-rw- 3 root root 4096 Mar 17 18:26 /media/bret/Data05
> drw-rw-rw- 3 root root 4096 Mar 17 19:35 /media/bret/Data06
> bret at bret-Aspire-V3-772-UbuntuMATE:~$ cat /etc/fstab
> # /etc/fstab: static file system information.
> #
> # Use 'blkid' to print the universally unique identifier for a
> # device; this may be used with UUID= as a more robust way to name devices
> # that works even if disks are added and removed. See fstab(5).
> #
> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
> # / was on /dev/sda15 during installation
> UUID=a0f4e2ea-1b4a-4e11-8162-b89944da2677 /               ext4
> errors=remount-ro 0       1
> # swap was on /dev/sda8 during installation
> UUID=8e723a5f-40f0-4550-a77e-347613015c7a none            swap    sw
>            0       0
> bret at bret-Aspire-V3-772-UbuntuMATE:~$ sudo cat /etc/fstab
> [sudo] password for bret:
> # /etc/fstab: static file system information.
> #
> # Use 'blkid' to print the universally unique identifier for a
> # device; this may be used with UUID= as a more robust way to name devices
> # that works even if disks are added and removed. See fstab(5).
> #
> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
> # / was on /dev/sda15 during installation
> UUID=a0f4e2ea-1b4a-4e11-8162-b89944da2677 /               ext4
> errors=remount-ro 0       1
> # swap was on /dev/sda8 during installation
> UUID=8e723a5f-40f0-4550-a77e-347613015c7a none            swap    sw
>            0       0
> "
>

Sorry - the two Dataxx partitions, as shown above, are clearly shown
in the response to the command that you specified (Note - that ia
after I applied the chmod 666, rather than the chmod660).The Dataxx
partitions not being displayed, applies to the response to the  cat
/etc/fstab command.

-- 

Bret Busby
Armadale
West Australia

..............

"So once you do know what the question actually is,
 you'll know what the answer means."
- Deep Thought,
 Chapter 28 of Book 1 of
 "The Hitchhiker's Guide to the Galaxy:
 A Trilogy In Four Parts",
 written by Douglas Adams,
 published by Pan Books, 1992

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