An error occurs in the tutorial colab file.

[maguro27]

Hi.
I got an error when I ran the code block two of the tutorial colab file.

ImportError: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /usr/local/lib/python3.7/dist-packages/phyre/simulator_bindings.cpython-37m-x86_64-linux-gnu.so)

The error still occurs though I tried to add GLIBCXX_3.4.26.
I added the below scripts before the import scripts.

!add-apt-repository ppa:ubuntu-toolchain-r/test
!apt-get update
!apt-get install gcc-4.9
!apt-get upgrade libstdc++6

After that, I check the version of GLIBCXX.

!strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX

GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_3.4.22
GLIBCXX_3.4.23
GLIBCXX_3.4.24
GLIBCXX_3.4.25
GLIBCXX_3.4.26
GLIBCXX_3.4.27
GLIBCXX_3.4.28
GLIBCXX_3.4.29
GLIBCXX_DEBUG_MESSAGE_LENGTH

I cannot fix the error though I confirmed GLIBCXX_3.4.26.
How do I fix it?