I have got the most strange problem, I downloaded 4 images yesterday, then cut and paste them using Nautilus into a sub-folder of my Documents area. I then closed Nautilus and went on with my normal business.
However later on I needed to send the images to someone so I went into the folder with the images using Nautilus, but they weren't there! And this is where it gets even stranger, the images show up, though not their thumbnails, when I use Firefox's file chooser for instance, or another program's file chooser, in fact if I open the Image Viewer and then use its file chooser to find them I can open and view them perfectly fine.
The other odd thing is that Nautilus half knows they are there, because my first reaction was to think that my computer just ate them somehow, so I redownloaded them, and pasted them into the folder where the previous ones should have been. Nautilus asked me if I wanted to replace the old with the new and it even showed me the correct thumbnails this time!
I am also able to see that the files are present in Terminal using commands such as ls and tree, I can also cat the contents so the files are readable and everything.
Here is the stat output for one of them:
stat DSCF2365.jpg
File: 'DSCF2365.jpg'
Size: 2213598 Blocks: 4328 IO Block: 4096 regular file
Device: fc00h/64512d Inode: 29623172 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ totoro) Gid: ( 1000/ totoro)
Access: 2016-08-02 23:39:15.651962645 +0100
Modify: 2016-08-02 22:51:26.613739542 +0100
Change: 2016-08-02 23:12:04.540134139 +0100
Birth: -
It was suggested to me that this could be because of a filesystem error, so I ran fsck on boot and this was the output in syslog:
Aug 3 10:54:45 <Computer-Name> kernel: [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro noprompt fsck.mode=force
Aug 3 10:54:45 <Computer-Name> systemd-fsck[2176]: fsck.fat 3.0.28 (2015-05-16)
Aug 3 10:54:45 <Computer-Name> systemd-fsck[2176]: /dev/sda1: 28 files, 3120/130812 clusters
Aug 3 10:54:45 <Computer-Name> systemd-fsck[2191]: /dev/sda2: 301/62496 files (22.6% non-contiguous), 129379/249856 blocks
Aug 3 10:54:45 <Computer-Name> kernel: [ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro noprompt fsck.mode=force
Aug 3 10:55:00 <Computer-Name> /usr/lib/gdm3/gdm-x-session[3200]: Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro noprompt fsck.mode=force
Aug 3 10:55:31 <Computer-Name> /usr/lib/gdm3/gdm-x-session[3341]: Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro noprompt fsck.mode=force
I will soon do the same checks from a LiveUSB, when I have done that I will update this question with the information on how that went. If this is useful to anyone the output of lsblk is:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
├─sda2 8:2 0 244M 0 part /boot
└─sda3 8:3 0 465G 0 part
├─ubuntu--gnome--vg-root 252:0 0 461.2G 0 lvm /
└─ubuntu--gnome--vg-swap_1 252:1 0 3.9G 0 lvm [SWAP]
sr0 11:0 1 1024M 0 rom
So I am using LVM. I am running Ubuntu GNOME 16.04 with GNOME 3.20. What could the problem be and what shall I do about it? The place to which I downloaded the second batch of the same files still shows them (my Downloads folder).
Information Update:
I have now tried installing nemo, and the issue is also present there.
And there is something even more interesting that I have discovered, if I search for the file names using nautilus and nemo, they do come up in the search results, their thumbnails show correctly, and I am able to open them!
The output of blkid is:
/dev/sda1: UUID="9936-E7FF" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="8054dcbf-83e1-4d42-bd5c-7a7ec2b5b563"
/dev/sda2: UUID="a1ee7705-4528-434a-8aca-54486d48093d" TYPE="ext2" PARTUUID="56930149-d506-4773-9b31-b9ab1fa3aed8"
/dev/sda3: UUID="4Fa3uc-So0F-4d6c-ePh9-Eb09-JMl1-30k45r" TYPE="LVM2_member" PARTUUID="3816306f-068b-4385-b2a9-a67e320d7b4a"
/dev/mapper/ubuntu--gnome--vg-root: UUID="925ad182-e013-4b66-8b0c-18e549a28f82" TYPE="ext4"
/dev/mapper/ubuntu--gnome--vg-swap_1: UUID="97995176-acae-4d9a-bb88-08adefd556df" TYPE="swap"
If I use the mv command to rename the file, it still does not show.
I have now looked again and the files have reappeared along with a lot of other files which were missing from that folder! I hope them reappearing hasn't made any others disappear, is there any way I can check? What could be causing this?
