I can't install plugins

I changed the mirrors, but now I have the GPG key error, I searched the forum, but I still haven't found a way to solve it

Reading package lists...
W: GPG error: https://mirror.nju.edu.cn/open…iavault-plugin-developers sandworm InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 326A835E697B890A
E: The repository 'https://mirror.nju.edu.cn/openmediavault/openmediavault-plugin-developers sandworm InRelease' is not signed.

I ran the command and it still doesn't give me the same error, I'm now trying to re-enable IPv6 to try to use it on the default mirror, since IPv6 was not blocked on the ISP

Quote from ryecoaaron

As I mentioned previously, github pages (where the omv-extras repo is located) does not listen on ipv6.

I don't know how, but here I enabled IPv6 in DHCP in the OMV network settings and run the apt clean command previously posted and it worked, I'm now able to install the openmediavault-remotemount that I wanted since the beginning of this saga, I'll post the result the apt clean below and the remote mount installation.

These were the errors that presented using IPv6, after enabling in OMV they no longer appeared:

Cannot initiate the connection to openmediavault-plugin-developers.github.io:443 (2606:50c0:8001::153). - connect (101: Network is unreachable) Cannot initiate the connection to openmediavault-plugin-developers.github.io:443 (2606:50c0:8002::153). - connect (101: Network is unreachable) Cannot initiate the connection to openmediavault-plugin-developers.github.io:443 (2606:50c0:8000::153). - connect (101: Network is unreachable) Cannot initiate the connection to openmediavault-plugin-developers.github.io:443 (2606:50c0:8003::153). - connect (101: Network is unreachable)

The commands were now executed on my OMV 1, which hadn't changed anything regarding repositories or mirrors, I'm going to revert the settings on my OMV 2 and try to do the same thing I did on OMV 1.

Quote from ryecoaaron

Maybe they do listen on ipv6 now. I don't have a good way to test.

Probably yes, I also have no idea how to do these tests, but I'm glad it worked

Thank you to everyone who took the time to come to this topic to help, I appreciate everyone.

One more question, how do I revert these repository mirrors to the defaults, I managed to revert some by editing some .list, but not all of them returned to the default.

omv-env set OMV_APT_REPOSITORY_URL "https://mirror.nju.edu.cn/openmediavault/public"
omv-env set OMV_APT_ALT_REPOSITORY_URL "https://mirror.nju.edu.cn/openmediavault/packages"
omv-env set OMV_APT_KERNEL_BACKPORTS_REPOSITORY_URL "https://mirror.nju.edu.cn/debian"
omv-env set OMV_APT_SECURITY_REPOSITORY_URL "https://mirror.nju.edu.cn/debian-security"
# 如果你有安装 omv-extras 则需要运行如下命令更改源
omv-env set OMV_EXTRAS_APT_REPOSITORY_URL "https://mirror.nju.edu.cn/openmediavault/openmediavault-plugin-developers"
omv-env set OMV_DOCKER_APT_REPOSITORY_URL "https://mirror.nju.edu.cn/docker-ce/linux/debian"
omv-env set OMV_PROXMOX_APT_REPOSITORY_URL "https://mirror.nju.edu.cn/proxmox/debian"
# 使得环境变量更改生效
omv-salt stage run all

Quote from ryecoaaron

The easiest way is to delete the relevant entries in /etc/default/openmediavault

It worked, now everything seems to be ok, thanks