Tried 19.10 by selecting simplified Chinese during booting the daily build
iso.  Was able to toggle (shift-key) between Chinese and English inputs.
This is good!

However, the ability to input Chinese characters was activated only after I
clicked on the third option "汉语（智能拼音）“。 For a Chinese user, this extra step
should not be necessary.

Also as shown in the attached screenshot, the first (top) two entries are
confusing and have no function.  Should be removed.

On Tue, Jul 2, 2019 at 3:25 PM Gunnar Hjalmarsson <
<email address hidden>> wrote:

> On 2019-07-03 02:16, Ping-Wu wrote:
> > How do I test it?  I'm interested in seeing Chinese input method
> > being able to be activated and behaving the way it is expected in a
> > LiveUSB, preferably in Ubuntu 18.04.3 iso.  Is there any pre-release
> > version of the 18.04.3 iso available?
>
> Besides verifying the test case above, and as mentioned in comment #24,
> I confirmed it on a 19.10 daily build ISO. You can do the same.
>
> I'm not aware of any pre-release ISOs, but most likely it will work also
> on 18.04.3.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1786344
>
> Title:
>   Default IBus input method ignored in live session
>
> Status in gnome-settings-daemon package in Ubuntu:
>   Fix Released
> Status in gnome-settings-daemon source package in Bionic:
>   Fix Committed
>
> Bug description:
>   [Impact]
>
>   If you
>
>   * start your computer with a bootable USB stick or DVD with the
>     18.04.2 desktop ISO
>
>   * wait until Ubiquity's welcome screen shows up (only possible on
>     systems with legacy BIOS; bug #1766047)
>
>   * select a language which requires an input method for typing
>
>   * click the "Try Ubuntu" button
>
>   no IBus method is made easily available via the input source indicator
>   in the session you enter. If you for instance select zh_CN as language
>   and "Try Ubuntu", you would expect to enter a session with the
>   "Intelligent Pinyin" method included among the available input
>   sources.
>
>   The proposed fix should ensure that an IBus method is always available
>   in "live sessions" in languages which are prepared for it.
>
>   [Test Case]
>
>   1. Install ibus-libpinyin and make sure that "Intelligent Pinyin" is
>      not included among your available input sources.
>
>   2. Generate the Chinese locale:
>
>      sudo locale-gen zh_CN.UTF-8
>
>   3. Add to ~/.profile this line:
>
>      export LC_CTYPE=zh_CN.UTF-8
>
>   4. Remove the gnome-settings-daemon stamp file:
>
>      rm ~/.local/share/gnome-settings-daemon/input-sources-converted
>
>   5. Log out and log in again.
>
>   => Find that the "Intelligent Pinyin" method was not added (since the
>   sources already in the list prevented it from being added).
>
>   6. Install gnome-settings-daemon from bionic-proposed.
>
>   7. Repeat step 4 and 5.
>
>   => Find that the "Intelligent Pinyin" method was added.
>
>   [Regression Potential]
>
>   The proposed upload includes a small change which specifically
>   addresses the issue as described above. I find that the risk for
>   adverse side effects is low.
>
>   [Original description]
>
>   Ubuntu 18.10 iso (2018.8.7), select Simplified Chinese for booting, can't
>   input Chinese character. From Settings -> Regions and Languages, selected
>   Intelligent Pinyin, also could not input Chinese.
>
>   ---
>
>   18.10 镜像（2018.8.7）选择简体中文开机，无法输入中文。由 Settings -> Regions and
>   Languages，选择 智能拼音，也无法输入中文。
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1786344/+subscriptions
>