There are a number of threads about the loss of WiFi password after reboot of the Nexus 5 and of the BQ M10 but not much about the same problem on the MEIZU Pro 5 apart from https://forums.ubports.com/topic/708/meizu-pro5-fastboot-mode-locked

I have a MEIZU Pro 5 with 4GB of RAM and Ubuntu Touch 16.04 UBports OTA-7. This is not the Ubuntu Touch edition. This phone came with Flyme OS and I installed Ubuntu on it. I need to re-enter the WiFi password after reboot.

The way this problem occurs is strange because the password is not completely lost. If I open the Settings, go to Wi-Fi and then to the list of Previous networks, my access point is still there and it does have the password. The problem is that when I select this access point in this list, the only option I have is to Forget this network. I can't enable the connection from the list of previous networks.

In order to connect to this access point, I have to select it from the current list of networks from which the password is lost. Once I enter again the password, the list of Previous networks creates a new entry with the same network name albeit with the suffix " 1" added to it. If I reboot again and do the same thing, a new entry appears once again, this time with the suffix " 2". And so on with the suffixes 3, 4, 5, etc...

Has anyone found out how to fix the problem since the thread mentioned above?

@kugiigi You are right. Thanks.

@doniks

Alright, I did find a file /home/phablet/.cache/libertine/puritine/PuritineSymlinkFarm.json and I deleted it. I don't know why I couldn't see it with find.

Yes I know I have to replace CONTAINER-IDENTIFIER with the identifier of my container, i.e. xenial.

~root refers to /root.

I have found the following text files which I deleted:
/.local/share/unity-scopes/unconfined/libertine-scope.ubuntu_libertine-scope/.surfacing_cache
/.local/share/unity-scopes/unconfined/clickscope/.surfacing_cache

But still no change, even after reboot. It seems that the container is very much contained and unbreakable! But don't worry, I am going to reinstall UT anyway.

Thank you to all for your help.

All Ubuntu Touch apps store user data in ~/.local/share/app-name/. It is impossible to open a file stored for instance in ~/Documents/.

One way around this would be to create a symbolic link:

 $ ln -s ~/Document/data-file ~/.local/share/app-name/link-to-data-file

Unfortunately, opening such a link with an app yield an empty file. However, if the data file were in the same directory as the link, then opening the link would yield the full non empty file. That is, if the link is created as:

 $ ln -s ~/.local/share/app-name/data-file ~/.local/share/app-name/link-to-data-file

then everything works fine.

It seems that Ubuntu Touch apps are blind to the directory tree. Does anybody know a way around this problem? How could one choose where to store data files and not be restricted to ~/.local/share/app-name/ ?

Is there an Ubuntu Touch Full Screen function similar to Ubuntu Desktop's F11 function? If not, would it be possible to have one? This would be particularly useful on the web browser when holding the phone in landscape position.

@kugiigi You are right. Thanks.

Whenever I rotate my Nexus 7 in landscape mode, I get a split screen instead of a full screen when using the web browser. Could anyone tell me how to get rid of this split?

@AlainW94 Yes I do have a /data/calibration/mac_addr file. It contains the same MAC address as the one displayed on Settings -> About.

Regarding the syslog file, here is the output for a search of @@@@:

cat /var/log/syslog | grep @@@@
Mar  7 14:44:30 ubuntu-phablet kernel: [    1.213373]  [7:  kworker/u16:0:    6] [c7] @@@@ SN rsa with sha1 verify failed!!!!
Mar  7 14:44:30 ubuntu-phablet kernel: [    1.213640]  [7:  kworker/u16:0:    6] [c7] @@@@ MAC verify failed!!!!
Mar  7 14:44:30 ubuntu-phablet kernel: [    1.213899]  [7:  kworker/u16:0:    6] [c7] @@@@ MAC verify failed!!!!

@AlainW94 Here are some errors found in /var/log/syslog:

cat /var/log/syslog | grep -i error

Mar  7 14:44:30 ubuntu-phablet kernel: [    0.591701]  [6:      swapper/0:    1] [c6] exynos-fimc-is-sensor: probe of 14110000.fimc_is_sensor failed with error -22

Mar  7 14:44:30 ubuntu-phablet kernel: [    1.532791]  [5:  kworker/u16:0:    6] [c5] [SensorHub]:MSG:AKM:408,error: 0x02030000
Mar  7 14:44:30 ubuntu-phablet kernel: [    2.003203]  [5:      swapper/0:    1] [c5] espresso_wifi_get_mac_addr:create file /data/calibration/mac_addr error(-2)
Mar  7 14:44:30 ubuntu-phablet kernel: [    2.003949]  [5:wl_event_handle: 1637] [c5] CFG80211-ERROR) wl_event_handler : tsk Enter, tsk = 0xffffffc0f35819e0

Mar  7 14:44:24 ubuntu-phablet kernel: [    9.196647]  [1: wpa_supplicant: 2415] [c1] CFGP2P-ERROR) wl_cfgp2p_add_p2p_disc_if : P2P interface registered

Mar  7 14:44:53 ubuntu-phablet kernel: [   38.413935]  [2: wpa_supplicant: 2415] [c2] CFG80211-ERROR) wl_cfg80211_sched_scan_start : Invalid sched scan req!! n_ssids:0 

and in dmesg:

dmesg | grep -i error

[  482.469508] [c3] CFG80211-ERROR) wl_cfg80211_sched_scan_start : Invalid sched scan req!! n_ssids:0 

@AlainW94 I tried again and I got the following output for syslog:

cat /var/log/syslog | grep wl0
Mar  7 14:44:23 ubuntu-phablet kernel: [    8.877130]  [6: NetworkManager: 3204] [c6] Firmware version = wl0: Nov 24 2015 11:23:00 version 7.45.71.r5 (r587357) FWID 01-ec3fd0c

@AlainW94 "cat /var/log/syslog | grep wl0" gives no output at all.

@AlainW94 from the beginning.

@AlainW94 I haven't tried to re-install Android and I am a bit reluctant to do so unless I have some evidence that this is the way to solve the password issue. I haven't tried the WiFi on Android. I replaced the factory OS with UT as soon as I got the phone. I have no reason to think that there was any WiFi problem with the factory settings. I don't know what WiFi "log files" are nor where to find them. I also don't know what WiFi band my phone is using.

The problem is that I am still in the dark as to whether the EFS partition is the issue or not.

When you wipe or format with TWRP, there are some options to choose what to wipe and what to keep. Could it be that those of us who wiped everything loose the WiFi password while those who didn't have no such loss?

I also don't know if re-installing Android would restore the EFS partition or not.