Situation

Warning: Not all of the space available to /dev/sdb appears to be used, you can fix the GPT to use all of the space (an extra 78131200 blocks) or continue with the current setting?
Fix/Ignore?

Installation

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  groff-base
Suggested packages:
  groff
The following NEW packages will be installed:
  gdisk groff-base
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 1354 kB of archives.
After this operation, 4103 kB of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 http://ftp.de.debian.org/debian stretch/main amd64 groff-base amd64 1.22.3-9 [1160 kB]
Get:2 http://ftp.de.debian.org/debian stretch/main amd64 gdisk amd64 1.0.1-1 [195 kB]
Fetched 1354 kB in 0s (4431 kB/s)
Selecting previously unselected package groff-base.
(Reading database ... 18554 files and directories currently installed.)
Preparing to unpack .../groff-base_1.22.3-9_amd64.deb ...
Unpacking groff-base (1.22.3-9) ...
Selecting previously unselected package gdisk.
Preparing to unpack .../gdisk_1.0.1-1_amd64.deb ...
Unpacking gdisk (1.0.1-1) ...
Setting up groff-base (1.22.3-9) ...
Setting up gdisk (1.0.1-1) ...