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I'm getting error after make command like,

undefined reference to `BlockAssembler::BlockAssembler(CChainParams const&)'

and in last

Makefile:774: recipe for target 'all-recursive' failed

make: **[all-recursive] Error 1

I have followed all steps given here:-

https://www.toshblocks.com/bitcoin/compile-bitcoin-source-code-ubuntu-16-04-lts/

Output :-

 Making all in src
    make[1]: Entering directory '/home/khushbu/bitcoin/src'
    make[2]: Entering directory '/home/khushbu/bitcoin/src'
    make[3]: Entering directory '/home/khushbu/bitcoin'
    make[3]: Leaving directory '/home/khushbu/bitcoin'
      CXXLD    bitcoind
    libbitcoin_server.a(libbitcoin_server_a-mining.o): In function `generateBlocks(std::shared_ptr<CReserveScript>, int, unsigned long, bool)':
    /home/khushbu/bitcoin/src/rpc/mining.cpp:122: undefined reference to `BlockAssembler::BlockAssembler(CChainParams const&)'
    /home/khushbu/bitcoin/src/rpc/mining.cpp:122: undefined reference to `BlockAssembler::CreateNewBlock(CScript const&, bool)'
    /home/khushbu/bitcoin/src/rpc/mining.cpp:128: undefined reference to `IncrementExtraNonce(CBlock*, CBlockIndex const*, unsigned int&)'
    libbitcoin_server.a(libbitcoin_server_a-mining.o): In function `getmininginfo(JSONRPCRequest const&)':
    /home/khushbu/bitcoin/src/rpc/mining.cpp:216: undefined reference to `nLastBlockWeight'
    /home/khushbu/bitcoin/src/rpc/mining.cpp:217: undefined reference to `nLastBlockTx'
    libbitcoin_server.a(libbitcoin_server_a-mining.o): In function `getblocktemplate(JSONRPCRequest const&)':
    /home/khushbu/bitcoin/src/rpc/mining.cpp:521: undefined reference to `BlockAssembler::BlockAssembler(CChainParams const&)'
    /home/khushbu/bitcoin/src/rpc/mining.cpp:521: undefined reference to `BlockAssembler::CreateNewBlock(CScript const&, bool)'
    /home/khushbu/bitcoin/src/rpc/mining.cpp:533: undefined reference to `UpdateTime(CBlockHeader*, Consensus::Params const&, CBlockIndex const*)'
    collect2: error: ld returned 1 exit status
    Makefile:3888: recipe for target 'bitcoind' failed
    make[2]: *** [bitcoind] Error 1
    make[2]: Leaving directory '/home/khushbu/bitcoin/src'
    Makefile:10190: recipe for target 'all-recursive' failed
    make[1]: *** [all-recursive] Error 1
    make[1]: Leaving directory '/home/khushbu/bitcoin/src'
    Makefile:774: recipe for target 'all-recursive' failed
    make: *** [all-recursive] Error 1

How to solve this error and compile bitcoin source code successfully?

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It looks like you're having linker errors, possibly due to the way you're installing and configuring the BerkeleyDB. It would help to post the output of the ./configure command. Bitcoin-core recommends installing it using the Bitcoin PPA:

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev

Then you don't have to run ./configure with the LDFLAGS andCPPFLAGS for BerkeleyDB.

I would recommend following the UNIX build instructions in the repository. First download the source code for the release you want from the repository releases.

$ tar xvzf v0.17.0.tar.gz && cd v0.17.0

Then follow the instructions in the link above.

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