The second error, regarding the panic about message/error mixup, is this
upstream issue:

https://github.com/grpc-ecosystem/grpc-gateway/pull/1016

The patch didn't apply cleanly to the 1.6.4 tree but it's trivial to
backport manually.

Unfortunately, while it did eliminate the panic, it unfortunately then
unblocked a bunch more test cases to be able to run, several of which
had their own failures:

    marshal_jsonpb_test.go:114: case 4: got = single_nested:<> 
uuid:"6EC2446F-7E89-4127-B3E6-5C05E6BECBA7" nested:<name:"foo" amount:12345 > 
uint64_value:18446744073709551615 enum_value:ONE oneof_string:"bar" 
map_value:<key:"a" value:ONE > map_value:<key:"b" value:ZERO > 
timestamp_value:<> ; want single_nested:<> 
uuid:"6EC2446F-7E89-4127-B3E6-5C05E6BECBA7" nested:<name:"foo" amount:12345 > 
uint64_value:18446744073709551615 enum_value:ONE oneof_string:"bar" 
map_value:<key:"a" value:ONE > map_value:<key:"b" value:ZERO > 
timestamp_value:<> ; spec={false false  true 0x97b170}
--- FAIL: TestJSONPbMarshal (0.00s)

    marshal_jsonpb_test.go:232: dest = 
&wrapperspb.UInt64Value{state:impl.MessageState{NoUnkeyedLiterals:pragma.NoUnkeyedLiterals{},
 DoNotCompare:pragma.DoNotCompare{}, DoNotCopy:pragma.DoNotCopy{}, 
atomicMessageInfo:(*impl.MessageInfo)(0xc0001a03a8)}, sizeCache:0, 
unknownFields:[]uint8(nil), Value:0x7b}; want 
&wrapperspb.UInt64Value{state:impl.MessageState{NoUnkeyedLiterals:pragma.NoUnkeyedLiterals{},
 DoNotCompare:pragma.DoNotCompare{}, DoNotCopy:pragma.DoNotCopy{}, 
atomicMessageInfo:(*impl.MessageInfo)(nil)}, sizeCache:0, 
unknownFields:[]uint8(nil), Value:0x7b}; input = "123"
--- FAIL: TestJSONPbUnmarshalFields (0.00s)

=== RUN   TestPopulateParameters
--- FAIL: TestPopulateParameters (0.00s)
panic: runtime error: invalid memory address or nil pointer dereference 
[recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xb0 pc=0x7bdda7]


I'm guessing there are also upstream fixes for those, but am becoming convinced 
that Balint is right and efforts would be better targeted to merge a newer 
version of the package.

** Patch added: "0001-Fix-hand-crafted-protobuf-message-1016.patch"
   
https://bugs.launchpad.net/ubuntu/+source/golang-github-grpc-ecosystem-grpc-gateway/+bug/1897179/+attachment/5413956/+files/0001-Fix-hand-crafted-protobuf-message-1016.patch

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https://bugs.launchpad.net/bugs/1897179

Title:
  Autopkgtest failure attempting to test deprecated/removed api

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