I don't know if it's the same issue as I get a different error message.
But I too can't run some snaps on 18.04
alan@hal:~$ snap version snap 2.32+18.04~pre5 snapd 2.32+18.04~pre5 series 16 ubuntu 18.04 kernel 4.15.0-12-generic
alan@hal:~$ which mumble /snap/bin/mumble alan@hal:~$ /snap/bin/mumble internal error, please report: running "mumble" failed: cannot find installed snap "mumble" at revision 71
alan@hal:~$ discord execl failed: No such file or directory child exited with status 1
1 alan@hal:~$ chromium internal error, please report: running "chromium" failed: cannot find installed snap "chromium" at revision 237
You get the idea.
I don't know if it's the same issue as I get a different error message.
But I too can't run some snaps on 18.04
alan@hal:~$ snap version
snap 2.32+18.04~pre5
snapd 2.32+18.04~pre5
series 16
ubuntu 18.04
kernel 4.15.0-12-generic
alan@hal:~$ which mumble
/snap/bin/mumble
alan@hal:~$ /snap/bin/mumble
internal error, please report: running "mumble" failed: cannot find installed snap "mumble" at revision 71
alan@hal:~$ discord
execl failed: No such file or directory
child exited with status 1
1 alan@hal:~$ chromium
internal error, please report: running "chromium" failed: cannot find installed snap "chromium" at revision 237
You get the idea.