Insync fail to sync Czech diacritics filename on KDE, but succeed in other env

Hello, I am having issue with KDE and syncing

I have two machinse both having manjaro stable installed, one is i3wm and the other is KDE plasma release.

Both are up to date, both are logged with the same account. Both version of Insync are from AUR and have same version number. None of the linux machinse have the file manager extension installed. Both are on ext4 filesystem.
I have absolutely no idea how this is DE dependant but it’s broken.

Restarting the app didn’t help. Both sync are set to custom directory in "/home/user/gDrive/’

Tagging our engineer @lpugoy and he will get back to you.

There is a possibility, that this is a full system issue, cause Arc archive manager have troubles to display Czech chars as well and Kactivities are failing when try to extract to a subdir with czech special characters.

Since it was a fresh install of Manjaro KDE plasma, many users will experience this issue.
There is a strong chance this is an KDE bug, not an insync bug.

I am dumping my system information just in case

System: Host: Kernel: 4.6.0-1-MANJARO x86_64 (64 bit gcc: 6.1.1) Desktop: KDE Plasma 5.6.4 (Qt 5.6.0) Distro: Manjaro Linux Machine: System: Hewlett-Packard (portable) product: HP EliteBook 8730w v: F.20 Mobo: Hewlett-Packard model: 30EC v: KBC Version 91.25 Bios: Hewlett-Packard v: 68PAD Ver. F.20 date: 12/07/2011 Battery BAT0: charge: 48.1 Wh 100.0% condition: 48.1/52.0 Wh (93%) model: Hewlett-Packard Primary status: Full CPU: Dual core Intel Core2 Duo P8700 (-MCP-) cache: 3072 KB flags: (lm nx sse sse2 sse3 sse4_1 ssse3 vmx) bmips: 10113 clock speeds: max: 2534 MHz 1: 1600 MHz 2: 1600 MHz Graphics: Card: Advanced Micro Devices [AMD/ATI] RV635/M86 [Mobility Radeon HD 3670] bus-ID: 01:00.0 Display Server: X.Org 1.17.4 driver: radeon Resolution: 1280x800@59.91hz GLX Renderer: Gallium 0.4 on AMD RV635 (DRM 2.43.0, LLVM 3.8.0) GLX Version: 3.0 Mesa 11.2.2 Direct Rendering: Yes Audio: Card-1 Advanced Micro Devices [AMD/ATI] RV635 HDMI Audio [Radeon HD 3600 Series] driver: snd_hda_intel bus-ID: 01:00.1 Card-2 Intel 82801I (ICH9 Family) HD Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 Sound: Advanced Linux Sound Architecture v: k4.6.0-1-MANJARO Network: Card-1: Intel 82567LM Gigabit Network Connection driver: e1000e v: 3.2.6-k port: 80c0 bus-ID: 00:19.0 IF: enp0s25 state: down mac: 00:25:b3:7c:0d:6c Card-2: Intel Ultimate N WiFi Link 5300 driver: iwlwifi bus-ID: 03:00.0 IF: wlp3s0 state: up mac: 00:21:6a:5f:84:3a Drives: HDD Total Size: 320.1GB (5.0% used) ID-1: /dev/sda model: Hitachi_HTS72323 size: 320.1GB Partition: ID-1: / size: 116G used: 15G (14%) fs: ext4 dev: /dev/sda2 Sensors: System Temperatures: cpu: 43.0C mobo: 30.0C gpu: 65.0 Fan Speeds (in rpm): cpu: N/A Info: Processes: 174 Uptime: 1:18 Memory: 2002.2/3857.2MB Init: systemd Gcc sys: 6.1.1 Client: Shell (bash 4.3.421) inxi: 2.3.0

@freed00m: If your locale is not set to a UTF-8 one, please try setting it then restarting Insync. You can check by running locale.

I already have since isntalation,

[frdm@galactica ~]$ locale locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory LANG=en_GB.UTF-8 LC_CTYPE="en_GB.UTF-8" LC_NUMERIC="en_GB.UTF-8" LC_TIME="en_GB.UTF-8" LC_COLLATE="en_GB.UTF-8" LC_MONETARY="en_GB.UTF-8" LC_MESSAGES="en_GB.UTF-8" LC_PAPER="en_GB.UTF-8" LC_NAME="en_GB.UTF-8" LC_ADDRESS="en_GB.UTF-8" LC_TELEPHONE="en_GB.UTF-8" LC_MEASUREMENT="en_GB.UTF-8" LC_IDENTIFICATION="en_GB.UTF-8" LC_ALL=

It still doesn’t work

Problem solved,

There is a bug in the installer of Manjaro calamares, when user select a language en_US.utf8 and time format to be the British 24h format. It fails horribly and set all the config to en_GB.utf8 but installs un_US.utf8. This missmatch will fuck up the entire locale support and insync and other filemanaging apps will fail.

Problem fix by post install of en_GB.utf8 packages.