After an Ubuntu Touch update on a Volla Phone
to 16.04 OTA-17, the camera, music & weather app
(and maybe more) do not work anymore.
(I'm not 100% sure, if this is related to the update,
since I also installed a bunch of apps, but the apps
started before.)

Starting the apps, after a short time there's
a spinning circle (to show that the app is busy),
but nothing happens.

After enabling the developer mode, remotely
login to the phone via ssh, I tried to start and
strace an app (while no other app was running)
like

$ ubuntu-app-launch com.ubuntu.camera_camera_3.2.3; strace -p `pgrep camera-app`

$ ubuntu-app-launch com.ubuntu.music_music_2.9.22; strace -p `pgrep qmlscene`

$ ubuntu-app-launch com.ubuntu.weather_weather_5.8.2; strace -p `pgrep qmlscene`

but all these attemps ended (after about 3940 lines) with

faccessat(AT_FDCWD, "/dev/hwbinder", R_OK|W_OK) = 0
clock_gettime(CLOCK_MONOTONIC, {XXXX, XXXXXXXXX}) = 0

and an endless repetition of the latter. Not sure, what the gettime spinlock is good for...

Does anyone have an idea what's going on here and
what can be done to find out?

Thanks,
Martin

After an Ubuntu Touch update on a Volla Phone
to 16.04 OTA-17, the camera, music & weather app
(and maybe more) do not work anymore.
(I'm not 100% sure, if this is related to the update,
since I also installed a bunch of apps, but the apps
started before.)

Starting the apps, after a short time there's
a spinning circle (to show that the app is busy),
but nothing happens.

After enabling the developer mode, remotely
login to the phone via ssh, I tried to start and
strace an app (while no other app was running)
like

$ ubuntu-app-launch com.ubuntu.camera_camera_3.2.3; strace -p `pgrep camera-app`

$ ubuntu-app-launch com.ubuntu.music_music_2.9.22; strace -p `pgrep qmlscene`

$ ubuntu-app-launch com.ubuntu.weather_weather_5.8.2; strace -p `pgrep qmlscene`

but all these attemps ended (after about 3940 lines) with

faccessat(AT_FDCWD, "/dev/hwbinder", R_OK|W_OK) = 0
clock_gettime(CLOCK_MONOTONIC, {XXXX, XXXXXXXXX}) = 0

and an endless repetition of the latter. Not sure, what the gettime spinlock is good for...

Does anyone have an idea what's going on here and
what can be done to find out?

Thanks,
Martin

@josele13
With my 2 primary partitions - a vfat/FAT32 and an ext4 one -
UT tells me that it found a partion to include (the FAT32, which is mounted afterwards)
and another one, which could not be added (the ext4, which probably has to be mounted manually...).
So UT did not "ask" about formatting a SD card (yet).
Why is it necessary that UT does not "see" the ext4 partition?
And why should a UT user care about Android? (I don't!)
But I'm still disappointed that UT is limited to an "outdated" file system and I don't
really understand why this is the case - notably for a Linux system like UT.
Portability should not play a big role, since most users don't remove the SD card often.
Hopefully the UT file systems support will get better one day...

@keneda
Thank you for the fast response and the hint. I was not aware of this "issue".
Hopefully this is fixed and also there will be improvements for the file system support
in the (near) future.

In the meantime I reformatted the SDXC with a primary FAT32 (32GB) and ext4 partition (rest)
and at least the FAT32 was recognized.
But I also did an upgrade to OTA-17 and now the
Music and Camera app don't seem to work any more. (only hourglass-like animation shown)
(A Logviewer app showed me for "v2.9.22 music":
Loading module: 'libubuntu_application_api_touch_mirclient.so.3.0.0'
library "libpq_cust.so" not found' )
Not sure if the upgrade was the reason (the problem still exists without the sdcard inserted),
but this problem will get now a higher priority...

The Ubuntu-VollaPhone offers (from the beginning) an app "Externe Speichermedien" ("External storage media"),
which shows an entry for an inserted SD card, but the button "Formatieren" ("Format") is greyed out.
Is it really true that Ubuntu Touch expects a FAT32 (vfat) formatted card?
SD Extended Capacity cards (>32GB) usually are preformatted with exFAT and for a Linux system probably
a filesystem like e.g. ext4 is much better suited. Most user won't remove and insert the card very often.
Since I don't use any Windows or Mac systems, I removed the card, repartioned and reformated it with
ext4 and changed the fstab to mount it, but...

What is default mount point for the SD card?
Why is the "external storage media" app not working?
I expect the app to reformat the card with a file system of my choice (e.g. ext4)...
Any clues?

Thanks,
Martin