install fastboot

 $ sudo apt install fastboot

[sudo] password for dhwan: 

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following additional packages will be installed:

  android-libbacktrace android-libetc1 android-libf2fs-utils

  android-libsparse android-libunwind android-libutils

  android-libziparchive android-sdk-platform-tools dmtracedump etc1tool

  f2fs-tools graphviz hprof-conv libann0 libcdt5 libcgraph6

  libf2fs-format4 libf2fs5 libgts-0.7-5 libgts-bin libgvc6 libgvpr2

  liblab-gamut1 libpathplan4 p7zip p7zip-full sqlite3

Suggested packages:

  graphviz-doc p7zip-rar sqlite3-doc

The following NEW packages will be installed:

  android-libbacktrace android-libetc1 android-libf2fs-utils

  android-libsparse android-libunwind android-libutils

  android-libziparchive android-sdk-platform-tools dmtracedump etc1tool

  f2fs-tools fastboot graphviz hprof-conv libann0 libcdt5 libcgraph6

  libf2fs-format4 libf2fs5 libgts-0.7-5 libgts-bin libgvc6 libgvpr2

  liblab-gamut1 libpathplan4 p7zip p7zip-full sqlite3

0 upgraded, 28 newly installed, 0 to remove and 19 not upgraded.

Need to get 4.802 kB of archives.

After this operation, 19,6 MB of additional disk space will be used.

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Get:5 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 android-libetc1 amd64 1:8.1.0+r23-2build1 [17,7 kB]

Get:6 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libf2fs5 amd64 1.11.0-1.1ubuntu1 [14,1 kB]

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Get:13 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libann0 amd64 1.1.2+doc-7build1 [26,0 kB]

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Get:16 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libgts-0.7-5 amd64 0.7.6+darcs121130-4 [150 kB]

Get:17 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libpathplan4 amd64 2.42.2-3build2 [21,9 kB]

Get:18 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libgvc6 amd64 2.42.2-3build2 [647 kB]

Get:19 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libgvpr2 amd64 2.42.2-3build2 [167 kB]

Get:20 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 liblab-gamut1 amd64 2.42.2-3build2 [177 kB]

Get:21 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 graphviz amd64 2.42.2-3build2 [590 kB]

Get:22 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 dmtracedump amd64 8.1.0+r23-3 [26,3 kB]

Get:23 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 etc1tool amd64 8.1.0+r23-1build1 [18,5 kB]

Get:24 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 fastboot amd64 1:8.1.0+r23-5ubuntu2 [58,5 kB]

Get:25 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 hprof-conv amd64 8.1.0+r23-2 [13,2 kB]

Get:26 http://id.archive.ubuntu.com/ubuntu focal-updates/main amd64 sqlite3 amd64 3.31.1-4ubuntu0.2 [860 kB]

Get:27 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 android-sdk-platform-tools amd64 27.0.0+12 [3.564 B]

Get:28 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libgts-bin amd64 0.7.6+darcs121130-4 [41,3 kB]

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update-initramfs: Generating /boot/initrd.img-5.8.0-41-generic