Installation error: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'

[Ho Thao]

I installed Qt5.10.0 on my computer (Ubuntu), and I got this error:

./qt-opensource-linux-x64-5.10.0.run

QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QXcbConnection: Could not connect to display
Core dumped

How I can fix this problem?
Thank you so much!

[jsulm]

@Ho-Thao Are you trying to start it as root/sudo?
Do you have X11 running?

[Ho Thao]

@jsulm
I use root#.
I installed X11, and got the error:
#yum install xorg
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile

• base: mirror.kakao.com
• centos-sclo-rh: mirror.kakao.com
• centos-sclo-sclo: mirror.kakao.com
• epel: mirrors.aliyun.com
• extras: mirror.kakao.com
• updates: mirror.kakao.com
  No package xorg available.
  Error: Nothing to do
  ..............

thank you!

[jsulm]

@Ho-Thao said in Installation error: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root':

I use root

Do you really have to?
You can install Qt in your home directory (what I always do), for that no root needed.

[mzimmers]

I realize this topic is old, but...I'm running into the same warning, and I have Qt installed under my home directory. Where should I be defining this variable?

[jsulm]

@mzimmers Which variable do you mean. When exactly do you get these warnings? When running installer (like OP) or when running your app? Do you have X11 server running?

[mzimmers]

@jsulm I was referring to XDG_RUNTIME_DIR. I'm seeing the same behavior the OP described in the title. This is at run time. I'm using WSL, so somewhere, there's a virtual X11 server.

Thanks.

[JonB]

@mzimmers
Are you running/logged in as root?

[mzimmers]

@JonB no, I'm not.

[SGaist]

Since you are on WSL, maybe related to this issue.

[mzimmers]

@SGaist I'm actually getting the app up and running, so I think WSL is working. I think it's just a matter of the path not being set. I'd have expected the project setup to have included this, but perhaps not.

This isn't a big deal; I was just wondering about it.