btrfs problem 12.04

[Johnny Rosenberg]

Copying the files from the USB drive from an Ubuntu 14.04 Live USB stick
worked fine. The only problem was that I needed to be root to do it, which
caused all the files to be owned by root, but I fixed that with a simple
find -exec chown command in the Ubuntu 12.04 terminal.

Thanks!



2015-10-28 17:02 GMT+01:00 Johnny Rosenberg <gurus.knugum at gmail.com>:

> 2015-10-28 12:45 GMT+01:00 Colin Law <clanlaw at gmail.com>:
>
>> On 28 October 2015 at 10:54, Petter Adsen <petter at synth.no> wrote:
>> > On Wed, 28 Oct 2015 11:38:12 +0100
>> > Johnny Rosenberg <gurus.knugum at gmail.com> wrote:
>> >
>> >> My desktop computer, with Ubuntu 14.04, failed on me today, it just
>> refuses
>> >> to start. I think I tried at least 40 times. I suspect the graphics
>> card,
>> >> but never mind. So I went down to the… whatever it's called in
>> Englist, a
>> >> place outside my apartment for storing things that are not used
>> regularly,
>> >> in this case located in the cellar, and found my old laptop with Ubuntu
>> >> 12.04. It's been a long time since I used it, so I didn't even
>> remember if
>> >> it works, but here I am now, typing this email with it.
>> >>
>> >> Anyway, I have a USB HDD for backups and so on I wanted to bring the
>> latest
>> >> versions of all my documents back to this old laptop, mostly ODF
>> files. The
>> >> problem is that the USB disk is formatted as btrfs, which indeed is
>> >> supported by Ubuntu 12.04 as well, but I get an error message that it
>> can't
>> >> be mounted. It asks me to do ”dmesg | tail” and here's the result:
>> >>
>> >> ~$ dmesg | tail
>> >> [ 2087.311210] sd 4:0:0:0: [sdb] No Caching mode page found
>> >> [ 2087.311216] sd 4:0:0:0: [sdb] Assuming drive cache: write through
>> >> [ 2087.327918] sdb: sdb1
>> >> [ 2087.332476] sd 4:0:0:0: [sdb] No Caching mode page found
>> >> [ 2087.332482] sd 4:0:0:0: [sdb] Assuming drive cache: write through
>> >> [ 2087.332487] sd 4:0:0:0: [sdb] Attached SCSI disk
>> >> [ 2087.929468] device label Backup 2000 devid 1 transid 1253 /dev/sdb1
>> >> [ 2087.930331] btrfs: disk space caching is enabled
>> >> [ 2087.930337] BTRFS: couldn't mount because of unsupported optional
>> >> features (60).
>> >> [ 2087.948115] btrfs: open_ctree failed
>> >> ~$
>> >>
>> >> So it seems like it ”couldn't mount because of unsupported optional
>> >> features”.
>> >> How can I install support for those ”optional features” on Ubuntu
>> 12.04? I
>> >> really need those files…
>> >> I'm reasonably sure the disk isn't encrypted.
>> >> I'm not very keen on upgrading to Ubuntu 14.04 at the moment since I
>> now at
>> >> least have something that kind of works…
>> >
>> > You would need a newer kernel that has support for the btrfs features
>> > that are missing from the 12.04 kernel.
>>
>> To get over your immediate problem you could boot off a live DVD of a
>> later Ubuntu and copy the data across from the stick to the hard disk.
>>
>
> That's an excellent idea really. Unfortunately I forgot to mention that
> this laptop's CD/DVD unit is broken and I don't have an USB one, BUT I
> guess I could try to create a 14.04 USB live stick and copy from there. I
> have 4 USB connections so should work.
>
> By the way, there is no stick. The USB disk is a HDD, but I guess that
> doesn't matter much.
>
> I kind of regret now that I went for btrfs when I installed Ubuntu on that
> desktop machine, maybe I should have waited for a couple of more years;
> Ext4 worked just fine for me. What's your opinion? What is the most
> reasonable file system for someone like me? That is someone who formats a
> drive to a certain file system and then never do anything fancy to the
> drive at all. I have very little need to resize partitions all the time and
> things like that.
>
>
> Johnny
>
>
>>
>> Colin
>>
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>
>
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