How to cancel a channel opening, wich tx is not shown

[Steampowered-hippo]

Hi,
I am using start9 with LND 0.17.4.
I tried to open a channel and checked "spend unconfirmed output".
Unfortunately the tx of the unspend output has a very low fee and seems to never get confirmed. In this state, the tx of my channel opening is not visible in the mempool. LND seems to broadcast the tx on and on.
I can not find a possibility to cancel this tx. Is there any?

[bitromortac]

You would need to double spend the output that's used for channel opening. Is the transaction you try to spend part of the LND wallet?

[Steampowered-hippo]

Can I anyhow use the commandline commands, even if I am on a start9 server?

[bitromortac]

I'm not familiar with start9, you would need access to the command line (perhaps https://docs.start9.com/0.3.5.x/user-manual/ssh is helpful).

[Steampowered-hippo]

unfortunately I receive an rpc-error, when I try to fire your commands. (logged in via ssh, into the docker, LND up and running).

[bitromortac]

Could you join Slack, I think it will be easier to troubleshoot there (could send me a message)?

[Steampowered-hippo]

Ok, I joined slack with your link.
which Channel?