Hi, i can’t install apps on my void linux, since yesterday. The message i got is:
Unable to load summary from remote flathub: Signature made 1970. jan. 1., csütörtök, 01:00:00 CET using [unknown name] key ID 562702E9E3ED7EE8
BAD signature from “Flathub Repo Signing Key flathub@flathub.org”
I have the same issue on voidlinux aswell
I am experiencing this too. I feel it must be a configuration issue on my system but I cannot determine what or where.
My issue is identical to OP’s with one small exception, the date it complains about is from 1969, not 1970:
[branon@minivoid ~]$ flatpak install flathub net.pcsx2.PCSX2
Looking for matches…
error: Unable to load summary from remote flathub: Signature made Wed 31 Dec 1969 07:00:00 PM EST using [unknown name] key ID 562702E9E3ED7EE8 BAD signature from "Flathub Repo Signing Key <flathub@flathub.org>"
Primary key ID 4184DD4D907A7CAE
Primary key expires Mon 14 Jun 2027 09:18:56 AM EDT
If I run flatpak remote-modify --no-gpg-verify flathub I get different behavior:
[branon@minivoid ~]$ flatpak install flathub net.pcsx2.PCSX2
Looking for matches…
error: Nothing matches net.pcsx2.PCSX2 in remote flathub
flatpak update fails with the same errors regardless of GPG verification settings:
[branon@minivoid ~]$ flatpak update
Looking for updates…
F: Warning: Treating remote fetch error as non-fatal since runtime/org.kde.Platform/x86_64/6.7 is already installed: No such ref 'runtime/org.kde.Platform/x86_64/6.7' in remote flathub (and so on for every installed package)
My Flatpak installation and Flathub remote are set up in --user mode, I am not using a system installation.
This is resolved after downgrading curl/libcurl: 8.11.0 seems to break flatpak update · Issue #15509 · curl/curl · GitHub
I am also having this issue.
Did you find the solution?
No. maybe the downgrade works, but i can’ do it in void. My system is new, i hava only the 8.11.0 version of curl, and i can’t install the 8.10.1 from the repository. i think i have to wait, the upgrade version of flatpak 
This is resolved after downgrading curl/libcurl: 8.11.0 seems to break flatpak update · Issue #15509 · curl/curl · GitHub
Please report this to your distro’s or Flatpak’s issue tracker.
eddykiss I can upload you the .xbps files ?
This was fixed by curl , you should ask your distro to patch curl.