Did you try it or is this speculation on your part It works 100% using gnome Xfce may need tweaks.
IF you read the Arch wiki it tells you the values to be changed for Xfce from gnome
Actually I haven’t found any that need to be changed for use on Gnome or XFCE - or even MATE and Cinnamon. I get lost on KDE (
) so I can’t say about that.
Apart from lua version / conky version troubles I haven’t seen problems with it in a few years - and that can be fixed with a conky rebuild as needed.
Between pairs of ``` (three backticks) please post the output suggested above for versions (-v) - and if you want, the conky that gives you trouble - I’ll be happy to troubleshoot it on my XFCE(s)
[andi@endeavouros ~]$ conky -v && lua -v
conky 1.11.5_pre compiled Tue 30 Jun 2020 05:45:40 AM UTC for Linux 5.6.8-arch1-1 x86_64
Compiled in features:
System config file: /etc/conky/conky.conf
Package library path: /usr/lib/conky
General:
- math
- hddtemp
- portmon
- IPv6
- Curl
- RSS
- Weather (METAR)
- wireless
- support for IBM/Lenovo notebooks
- nvidia
- builtin default configuration
- old configuration syntax
- Imlib2
- OSS mixer support
- apcupsd
- iostats
- ncurses
- Internationalization support
- PulseAudio
X11: - Xdamage extension
- Xinerama extension (virtual display)
- Xshape extension (click through)
- XDBE (double buffer extension)
- Xft
- ARGB visual
- Own window
Music detection:
- CMUS
- MPD
- MOC
Default values:
- Netdevice: eno1
- Local configfile: $HOME/.conkyrc
- Localedir: /usr/share/locale
- Maximum netdevices: 256
- Maximum text size: 16384
- Size text buffer: 256
Lua 5.4.0 Copyright © 1994-2020 Lua.org, PUC-Rio
Hey cool, i copied your conky.config in my conky.config and voila, its running and conky doesn´t disappear.
Only some modifications and then it is ready for working!
Thank you all for your help

Only one limitation here - there appear to be no bindings for lua (cairo graphics) in your version of conky. For contrast - here is my result for conky -v
conky -v
┌04:39:23 WD= [~]
└───freebird@nest ─▶$ conky -v
conky 1.11.5_pre compiled Sat 22 Aug 2020 02:33:18 AM EDT for Linux 5.8.1-arch1-1 x86_64
Compiled in features:
System config file: /etc/conky/conky.conf
Package library path: /usr/lib/conky
General:
* math
* hddtemp
* portmon
* IPv6
* Curl
* iconv
* wireless
* support for IBM/Lenovo notebooks
* builtin default configuration
* old configuration syntax
* Imlib2
* OSS mixer support
* apcupsd
* iostats
* ncurses
* Internationalization support
Lua bindings:
* Cairo
* Imlib2
* RSVG
X11:
* Xdamage extension
* Xinerama extension (virtual display)
* Xshape extension (click through)
* XDBE (double buffer extension)
* Xft
* ARGB visual
* Own window
Music detection:
* Audacious
* CMUS
* MPD
* MOC
Default values:
* Netdevice: eno1
* Local configfile: $HOME/.conkyrc
* Localedir: /usr/share/locale
* Maximum netdevices: 256
* Maximum text size: 16384
* Size text buffer: 256
If you’re going to be using conky for much, I suggest looking at the conky-cairo you find in the AUR - lua will run much better from it.
Feel free to ask if you have any config issues with the conky - I’ve modded a LOT of them
(and that means I’ve seen most of the resulting foulups too)
This is ok on version side…
The culprit on what you showed at first was this simple quotes marks missing here :
own_window_hints = 'undecorated,below,sticky,skip_taskbar,skip_pager',
own_window_hints = undecorated,below,sticky,skip_taskbar,skip_pager,
This in my conky i post yesterday.
As @FLVAL said, you’re missing the single quotes, which may have been the issue. I overlooked it yesterday, but he’s right. The version @mandog posted had the quotes, which may be why it worked correctly.
Oh no
Im a idiot, you are right. now i gave the hints quotes and the issue is solved!
thank you so much @FLVAL and @bkaplan for your help. you are the best

Can somebody set the answer of @FLVAL as solution. i can´t do this! Thanks 
Done! 