docker command not found

[rockyhwang]

Even I execute $ sudo apt-get install docker.io
I still get the following errors. Please advise what should I do further to conquer the problem.
I got similar problems when I try to make sidetree-fabric repository,too. Thanks a lot!

make: docker: Command not found
/bin/sh: docker: not found
Building sidetree-mock
go: downloading github.com/trustbloc/sidetree-core-go v0.1.4-0.20200720163951-97e8fe7645c3
go: downloading github.com/sirupsen/logrus v1.4.2
go: downloading github.com/spf13/viper v1.4.0
go: extracting github.com/trustbloc/sidetree-core-go v0.1.4-0.20200720163951-97e8fe7645c3
go: extracting github.com/spf13/viper v1.4.0
go: extracting github.com/sirupsen/logrus v1.4.2
go: downloading github.com/spf13/cast v1.3.0
go: downloading github.com/fsnotify/fsnotify v1.4.7
go: downloading golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
go: downloading github.com/trustbloc/edge-core v0.1.4-0.20200709143857-e104bb29f6c6
go: downloading github.com/gorilla/mux v1.7.3
go: downloading github.com/spf13/jwalterweatherman v1.0.0
go: downloading github.com/mitchellh/mapstructure v1.1.2
go: downloading github.com/pelletier/go-toml v1.2.0
go: extracting github.com/spf13/cast v1.3.0
go: downloading github.com/rs/cors v1.7.0
go: downloading github.com/hashicorp/hcl v1.0.0
go: extracting github.com/fsnotify/fsnotify v1.4.7
go: downloading github.com/evanphx/json-patch v4.1.0+incompatible
go: downloading github.com/square/go-jose/v3 v3.0.0-20191119004800-96c717272387
go: extracting github.com/trustbloc/edge-core v0.1.4-0.20200709143857-e104bb29f6c6
go: extracting github.com/pelletier/go-toml v1.2.0
go: downloading github.com/magiconair/properties v1.8.0
go: extracting github.com/rs/cors v1.7.0
go: extracting github.com/mitchellh/mapstructure v1.1.2
go: extracting github.com/spf13/jwalterweatherman v1.0.0
go: extracting github.com/gorilla/mux v1.7.3
go: downloading github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
go: extracting github.com/evanphx/json-patch v4.1.0+incompatible
go: downloading github.com/btcsuite/btcd v0.20.1-beta
go: downloading github.com/pkg/errors v0.9.1
go: downloading gopkg.in/yaml.v2 v2.2.8
go: extracting github.com/hashicorp/hcl v1.0.0
go: extracting github.com/square/go-jose/v3 v3.0.0-20191119004800-96c717272387
go: downloading github.com/spf13/pflag v1.0.3
go: downloading golang.org/x/crypto v0.0.0-20200210222208-86ce3cb69678
go: downloading github.com/spf13/afero v1.1.2
go: extracting github.com/magiconair/properties v1.8.0
go: downloading github.com/multiformats/go-multihash v0.0.13
go: extracting github.com/spf13/pflag v1.0.3
go: extracting gopkg.in/yaml.v2 v2.2.8
go: downloading github.com/stretchr/testify v1.4.0
go: extracting github.com/pkg/errors v0.9.1
go: extracting github.com/multiformats/go-multihash v0.0.13
go: downloading github.com/multiformats/go-varint v0.0.5
go: downloading github.com/minio/sha256-simd v0.1.1
go: extracting github.com/spf13/afero v1.1.2
go: downloading github.com/spaolacci/murmur3 v1.1.0
go: extracting github.com/stretchr/testify v1.4.0
go: downloading github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
go: extracting github.com/spaolacci/murmur3 v1.1.0
go: downloading github.com/mr-tron/base58 v1.1.3
go: extracting github.com/multiformats/go-varint v0.0.5
go: downloading golang.org/x/text v0.3.0
go: extracting github.com/minio/sha256-simd v0.1.1
go: downloading github.com/pmezard/go-difflib v1.0.0
go: extracting golang.org/x/crypto v0.0.0-20200210222208-86ce3cb69678
go: extracting github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
go: downloading github.com/davecgh/go-spew v1.1.1
go: extracting github.com/pmezard/go-difflib v1.0.0
go: extracting github.com/mr-tron/base58 v1.1.3
go: extracting github.com/davecgh/go-spew v1.1.1
go: extracting github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
go: extracting github.com/btcsuite/btcd v0.20.1-beta
go: extracting golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
go: extracting golang.org/x/text v0.3.0
go: finding github.com/sirupsen/logrus v1.4.2
go: finding golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
go: finding github.com/spf13/viper v1.4.0
go: finding github.com/fsnotify/fsnotify v1.4.7
go: finding github.com/hashicorp/hcl v1.0.0
go: finding github.com/magiconair/properties v1.8.0
go: finding github.com/mitchellh/mapstructure v1.1.2
go: finding github.com/pelletier/go-toml v1.2.0
go: finding github.com/spf13/afero v1.1.2
go: finding golang.org/x/text v0.3.0
go: finding github.com/spf13/cast v1.3.0
go: finding github.com/spf13/jwalterweatherman v1.0.0
go: finding github.com/spf13/pflag v1.0.3
go: finding gopkg.in/yaml.v2 v2.2.8
go: finding github.com/trustbloc/sidetree-core-go v0.1.4-0.20200720163951-97e8fe7645c3
go: finding github.com/pkg/errors v0.9.1
go: finding github.com/trustbloc/edge-core v0.1.4-0.20200709143857-e104bb29f6c6
go: finding github.com/stretchr/testify v1.4.0
go: finding github.com/davecgh/go-spew v1.1.1
go: finding github.com/pmezard/go-difflib v1.0.0
go: finding github.com/evanphx/json-patch v4.1.0+incompatible
go: finding github.com/multiformats/go-multihash v0.0.13
go: finding github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
go: finding github.com/minio/sha256-simd v0.1.1
go: finding github.com/mr-tron/base58 v1.1.3
go: finding github.com/multiformats/go-varint v0.0.5
go: finding github.com/spaolacci/murmur3 v1.1.0
go: finding golang.org/x/crypto v0.0.0-20200210222208-86ce3cb69678
go: finding github.com/btcsuite/btcd v0.20.1-beta
go: finding github.com/square/go-jose/v3 v3.0.0-20191119004800-96c717272387
go: finding github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
go: finding github.com/gorilla/mux v1.7.3
go: finding github.com/rs/cors v1.7.0
........
make: *** [Makefile:81: bddtests] Error 1