ffplay is a tool to play images inside a folder without saving a video. See command options here
But the problem is the filenames in my folder do not have a pattern, as they are sampled unevenly.
Let's consider a worst case
./myfolder
./myfolder/1.jpg
./myfolder/5.jpg
./myfolder/132.jpg
./myfolder/2699.jpg
./myfolder/121484.jpg
./myfolder/223655.jpg
...
How to play those images by the order generated from the system (file order)?
I was installing Chinese pinyin input method on Ibus. But I found that the keyboard layout setting can not be used.
In addition, when I click that keyboard layout button, I got the following error
Then I tried to run gkbd-keyboard-display in terminal, but it returns error
mycomputer~%: (gkbd-keyboard-display:15972): GnomeKbdIndicator-CRITICAL **: 15:56:59.390: Either layout or group have to be specified
After running command gsettings get org.gnome.desktop.input-sources sources, I got output
@a(ss) []
System: Ubuntu 18.04
Desktop: Gnome 3.28.4
Additional weird phenomina:
The user panel is corrupted. They are mis-placed, disfigured, and does not work 
By executing ls -la ~/.config/dconf, it returns
myusername@mypc:~$ ls -la ~/.config/dconf
total 32
drwxr-xr-x 2 myusername myusername 4096 Jun 2 11:57 .
drwxr-xr-x 57 myusername myusername 4096 Jun 1 15:02 ..
-rw-r--r-- 1 myusername myusername 20750 Jun 2 11:57 user
I have 3 locations in file managers　previously in 17.10.
After upgrading to 18.04, they are not working anymore,
error: Unhandled error message: Failed to mount Windows share: Connection timed out
Then I tried to manually mount them:
sudo mount.cifs //****/**** /mnt/share -o username=***, domain=***,vers=1.0
Error:
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
Then I tried to check tail -f /var/log/kern.log, it shows:CIFS VFS: Malformed UNC in devname.
How do I solve it?