The cursor in active terminal window stops blinking after ten seconds.

Confirmed and sent upstream. Behaviour doesn't appear with Natty gnome-terminal 2.32.1.

Upstream set bug as invalid.
Comment from developer:
That's normal. The cursor stops to blink after a timeout, in order to save
energy.

Since it's no show-stopper wondering if it's a papercut or wishlist. Olli, any feedback on this?

It's nothing I can't live with, but as stated in the original bug description, it's somewhat annoying when you don't realize that it's supposed to do that.
Imho it deters users with more experience from upgrading.
The action should be some kind of extra power saving option and not on by default.

I've found energy saving as argument at this point kind of absurd, refraining from negative list of apps, servers, cars ... , questioning the impact it seems rather a political than usability argument.
I'd expect to visualize if a terminal window has focus or not, without a blinking cursor there is no such indication.
Agreed on an opt-in option, but since it sounds like a final decision from upstream I'll have a look at other terminal apps.

I agree, many times the blinking cursor is just what is needed to indicate that the focused terminal is working as intended or for example a connection to a server is live.

Removing the blinking makes simple monitoring of the focused terminal impossible.

Upstream should rethink their position on this, as I suspect the power saved is so miniscule that it's completely neglectable compared to the severe issues removing the blinking causes with the usability.

Just came along another bug (1096810) which reminded me of the workaround for this one.
Install dconf-tools, run dconf-editor, go to org.gnome.desktop.interface, adjust cursor-blink-timeout as preferred.

I'd like to report that the workaround suggested in comment #8 has no effect in Xubuntu 18.04. It seems the native xfce4-terminal is also affected. I thought I'd solve the issue by switching to a terminal that isn't built on GTK so I installed Eterm, only to learn that not only does the cursor not blink by default in Eterm, but there is in fact no way to enable cursor blinking. When did the world decide that cursor blinking is a cancer to be eradicated from the face of the earth?

I have to agree 99999999% with @Olli Kankare.

"To save energy" is so ridiculous that is hilarious!

A simple blinking cursor that suddenly just stops for no reason, looks like the system has CRASHED!! This is even more important when you deal with the system's TERMINAL!

Anywhere else the cursor keeps blinking normally. It definitely should be the default setting.

I thought I would add the workaround I found which applies to Xubuntu 18.04 but possibly others:

To make the cursor keep blinking in GTK-based applications (which includes gnome-terminal, xfce4-terminal, gedit, pidgin and many others):

1. Open Settings Editor from the Settings menu.
2. Select the xsettings "channel" on the left side of the interface.
3. Click New.
4. The name of the property needs to be /Gtk/CursorBlinkTimeout
5. Set it to be an integer property.
6. Specify a very large number (but less than 2 billion).
7. Click Save

Here's hoping the GNOME group somehow ceases to exist in the near future.

Taking a second look at my workaround, I realize now that the "Settings Editor" is actually xfce4-settings-editor so this presumably only applies to Xubuntu or a system which otherwise has xfce as the desktop environment.