Hi all,
I am new to this forum, I hope I'm writing in the right place.
I have a problem accessing the Workspace Theme section in system settings.
When I click on it, the window content stops refreshing (..sort of) and it's somewhat blocked. Occasionally moving the cursor on some parts of the window will still make appear some ovals with text in it (the usual things that appear when hovering on something that explain what that is).
Still, I can only close the window (or reducing to icon, resizing, whatever).
In order to investigate, I tried to start systemsettings5 from the konsole. There were no errors until I clicked on Workspace Theme, this is the output:

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~$ systemsettings5
org.kde.kcoreaddons: Error loading plugin "kcm_lookandfeel" "La libreria dinamica non è stata trovata."
Plugin search paths are ("/usr/lib/x86_64-linux-gnu/qt5/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion

Clicking again shows other errors:

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~$ systemsettings5
org.kde.kcoreaddons: Error loading plugin "kcm_lookandfeel" "La libreria dinamica non è stata trovata."
Plugin search paths are ("/usr/lib/x86_64-linux-gnu/qt5/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
org.kde.kcoreaddons: Error loading plugin "kcm_desktoptheme" "La libreria dinamica non è stata trovata."
Plugin search paths are ("/usr/lib/x86_64-linux-gnu/qt5/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3085
Could not resolve property : radialGradient3101
Could not resolve property : radialGradient3139
Could not resolve property : radialGradient3133
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3047
Could not resolve property : radialGradient3041
Could not resolve property : radialGradient3079
Could not resolve property : radialGradient3073
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3085
Could not resolve property : radialGradient3101
Could not resolve property : radialGradient3139
Could not resolve property : radialGradient3133
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3047
Could not resolve property : radialGradient3041
Could not resolve property : radialGradient3079
Could not resolve property : radialGradient3073
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505

The first errors talk about missing kcm_lookandfeel and kcm_desktoptheme files, and something about QT_PLUGIN_PATH maybe not being set correctly.The files do exist:

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~$ locate kcm_lookandfeel | grep /usr/lib
/usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_lookandfeel.so
~$ locate kcm_desktoptheme | grep /usr/lib
/usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_desktoptheme.so

I created the env variable:

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export QT_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/

Calling again systemsettings5 now gives less errors:

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~$ systemsettings5
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3085
Could not resolve property : radialGradient3101
Could not resolve property : radialGradient3139
Could not resolve property : radialGradient3133
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3047
Could not resolve property : radialGradient3041
Could not resolve property : radialGradient3079
Could not resolve property : radialGradient3073
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3118
Could not resolve property : radialGradient3112
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3321
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3327
Could not resolve property : radialGradient3085
Could not resolve property : radialGradient3101
Could not resolve property : radialGradient3139
Could not resolve property : radialGradient3133
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505
Could not resolve property : radialGradient3047
Could not resolve property : radialGradient3041
Could not resolve property : radialGradient3079
Could not resolve property : radialGradient3073
Could not resolve property : radialGradient3499
Could not resolve property : radialGradient3505


And I don't really know what to do. I looked for these errors online, and there seem to be a lot of references in different contexts, regarding plasma5 instability, stuff, and other stuff. I am confused about what can I do next in order to solve the problem.

I am running Kubuntu 16.10 on a macbook mid 2007. Here's some info:

inxi -Fz

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~$ inxi -Fz
System:    Host: bianca-MacBook Kernel: 4.8.0-34-generic x86_64 (64 bit) Desktop: KDE Plasma 5.7.5
           Distro: Ubuntu 16.10
Machine:   System: Apple (portable) product: MacBook2 1 v: 1.0
           Mobo: Apple model: Mac-F4208CAA v: PVT BIOS: Apple v: MB21.88Z.00A5.B07.0706270922 date: 06/27/07
CPU:       Dual core Intel Core2 T7400 (-MCP-) cache: 4096 KB
           clock speeds: max: 2167 MHz 1: 2167 MHz 2: 2167 MHz
Graphics:  Card: Intel Mobile 945GM/GMS 943/940GML Express Integrated Graphics Controller
           Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) Resolution: 1280x800@59.91hz
           GLX Renderer: Mesa DRI Intel 945GM GLX Version: 1.4 Mesa 12.0.3
Audio:     Card Intel NM10/ICH7 Family High Definition Audio Controller driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.8.0-34-generic
Network:   Card-1: Marvell 88E8053 PCI-E Gigabit Ethernet Controller driver: sky2
           IF: enp1s0 state: down mac: <filter>
           Card-2: Qualcomm Atheros AR5418 Wireless Network Adapter [AR5008E 802.11(a)bgn] (PCI-Express)
           driver: ath9k
           IF: wls1 state: up mac: <filter>
Drives:    HDD Total Size: 120.0GB (13.6% used) ID-1: /dev/sda model: FUJITSU_MHW2120B size: 120.0GB
Partition: ID-1: / size: 35G used: 14G (42%) fs: ext4 dev: /dev/sda10
           ID-2: swap-1 size: 2.05GB used: 0.06GB (3%) fs: swap dev: /dev/sda9
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 60.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 210 Uptime: 6 min Memory: 1436.9/1968.9MB Client: Shell (bash) inxi: 2.3.1

This happens sometimes when themes fail to get extracted by the theme installer.

The downloaded theme package should still be in a temporary directory within your hidden ~/.kde configuration folder. Look for it there.

/home/username/.kde/tmp-folder/theme.tar.gz

When you find it, extract the theme package, then place the contents of that theme package in:

/home/username/.kde/share/apps/desktoptheme/

Now you will be able to go to System Settings -> Workspace Appearance -> Desktop Theme and find and select the theme.

Themes can also be downloaded with your web browser from kde-look.org too.
Look for the section called Plasma Themes to get desktop themes.