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I am trying to work on an example provided at:

CheckMarx Example

$ ./ddenv
Pulling ganache (trufflesuite/ganache-cli:latest)...
ERROR: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
zulfi@lc2530hz:~/solidity-ddenv$ ./ddenv
Pulling ganache (trufflesuite/ganache-cli:latest)...
latest: Pulling from trufflesuite/ganache-cli
5d20c808ce19: Pull complete
50ae34e155d6: Pull complete
f9ababc18615: Pull complete
05d711c49f92: Pull complete
3acbdde6eb14: Pull complete
87e1f85f1d0c: Pull complete
097623d3239f: Pull complete
06a051608e02: Pull complete
c019985a5729: Pull complete
51e424e6b1c2: Pull complete
1d24a8032d87: Pull complete
Building truffle
Step 1/4 : FROM alpine:latest
ERROR: Service 'truffle' failed to build: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

I think the script has already installed ganache, is it necessary to install Truffle because I already have Truffle installed on my machine?

I have Ubuntu 18.04 installed on my machine.

Somebody please guide me.

Zulfi.

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