问题原因：the colab system is updated from v18.04 to ubuntu 20.04 LTS recently

处理方式：

參考[metrizable] https://github.com/googlecolab/colabtools/issues/3347/
"Since Ubuntu 20.04+ no longer distributes chromium-browser outside of a snap package, you can install a compatible version from the Debian buster repository"
解决方法来源： 【已解決】Google Colab 無法執行 Selenium。報錯：Service chromedriver unexpectedly exited. Status code was: 1 - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天 (ithome.com.tw)

Colab安裝(在独立的单元格内执行以下指令)：

%%shell
# Ubuntu no longer distributes chromium-browser outside of snap
#
# Proposed solution: https://askubuntu.com/questions/1204571/how-to-install-chromium-without-snap

# Add debian buster
cat > /etc/apt/sources.list.d/debian.list <<'EOF'
deb [arch=amd64 signed-by=/usr/share/keyrings/debian-buster.gpg] http://deb.debian.org/debian buster main
deb [arch=amd64 signed-by=/usr/share/keyrings/debian-buster-updates.gpg] http://deb.debian.org/debian buster-updates main
deb [arch=amd64 signed-by=/usr/share/keyrings/debian-security-buster.gpg] http://deb.debian.org/debian-security buster/updates main
EOF

# Add keys
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys DCC9EFBF77E11517
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 648ACFD622F3D138
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 112695A0E562B32A

apt-key export 77E11517 | gpg --dearmour -o /usr/share/keyrings/debian-buster.gpg
apt-key export 22F3D138 | gpg --dearmour -o /usr/share/keyrings/debian-buster-updates.gpg
apt-key export E562B32A | gpg --dearmour -o /usr/share/keyrings/debian-security-buster.gpg

# Prefer debian repo for chromium* packages only
# Note the double-blank lines between entries
cat > /etc/apt/preferences.d/chromium.pref << 'EOF'
Package: *
Pin: release a=eoan
Pin-Priority: 500


Package: *
Pin: origin "deb.debian.org"
Pin-Priority: 300


Package: chromium*
Pin: origin "deb.debian.org"
Pin-Priority: 700
EOF

# Install chromium and chromium-driver
apt-get update

apt-get install chromium chromium-driver

# Install selenium
pip install selenium

colab执行测试（ok）

from selenium import webdriver
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--headless')
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--disable-dev-shm-usage')
wd = webdriver.Chrome('chromedriver',options=chrome_options)
wd.get("https://github.com/googlecolab/colabtools/issues/3347")
wd.save_screenshot('test.png')

报错情况

解决之后