This is on another computer with Nvidia graphics, installed yesterday. The indicators works OK on this one too.
Code:
p-i@pi-GA-990FXA-UD3:~$ apt list --installed | grep indicator
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
gnome-shell-extension-appindicator/cosmic,cosmic,now 22-1 all [installed,automatic]
libappindicator1/cosmic,now 12.10.1+18.04.20180322.1-0ubuntu1 amd64 [installed,automatic]
libappindicator3-1/cosmic,now 12.10.1+18.04.20180322.1-0ubuntu1 amd64 [installed,automatic]
libindicator3-7/cosmic,now 16.10.0+18.04.20180321.1-0ubuntu1 amd64 [installed,automatic]
libindicator7/cosmic,now 16.10.0+18.04.20180321.1-0ubuntu1 amd64 [installed,automatic]
p-i@pi-GA-990FXA-UD3:~$