Comment 14 for bug 1794936

That worked better:

root@bionic:~# apt source golang-petname
Reading package lists... Done
NOTICE: 'golang-petname' packaging is maintained in the 'Bzr' version control system at:
https://code.launchpad.net/petname/petname/trunk
Please use:
bzr branch https://code.launchpad.net/petname/petname/trunk
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 20.9 kB of source archives.
Get:1 http://archive.ubuntu.com/ubuntu bionic/universe golang-petname 2.8-0ubuntu2 (dsc) [2113 B]
Get:2 http://archive.ubuntu.com/ubuntu bionic/universe golang-petname 2.8-0ubuntu2 (tar) [13.6 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic/universe golang-petname 2.8-0ubuntu2 (diff) [5148 B]
Fetched 20.9 kB in 1s (32.1 kB/s)
dpkg-source: info: extracting golang-petname in golang-petname-2.8
dpkg-source: info: unpacking golang-petname_2.8.orig.tar.gz
dpkg-source: info: unpacking golang-petname_2.8-0ubuntu2.debian.tar.xz
W: Download is performed unsandboxed as root as file 'golang-petname_2.8-0ubuntu2.dsc' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
root@bionic:~# cd golang-petname-*/
root@bionic:~/golang-petname-2.8# sed -i -e 's/golang-go/gccgo-go/' debian/control
root@bionic:~/golang-petname-2.8# apt build-dep ./
Note, using directory './' to get the build dependencies
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  golang-1.10-go golang-1.10-src golang-src libfreetype6
Use 'apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 23 not upgraded.
root@bionic:~/golang-petname-2.8# dpkg-buildpackage
dpkg-buildpackage: info: source package golang-petname
dpkg-buildpackage: info: source version 2.8-0ubuntu2
[...]
 dpkg-genbuildinfo
 dpkg-genchanges >../golang-petname_2.8-0ubuntu2_amd64.changes
dpkg-genchanges: info: not including original source code in upload
 dpkg-source --after-build golang-petname-2.8
dpkg-buildpackage: info: binary and diff upload (original source NOT included)
root@bionic:~/golang-petname-2.8# dpkg -l dh-golang
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-============================-===================-===================-==============================================================
ii dh-golang 1.34.2 all debhelper add-on for packaging software written in Go (golang)