在 Ubuntu 16.04 上升级 gcloud 在 postinst 配置上失败。 google-cloud-sdk 已经安装并使用，没有安装问题，但这会在配置阶段中止升级。问题似乎是 postinst 脚本正在使用 Python2 解释器执行 Python3 脚本，该脚本在 Python3 语法行上失败。

# sudo dpkg --configure google-cloud-sdk 
Setting up google-cloud-sdk (131.0.0-0) ... 
dpkg: error processing package google-cloud-sdk (--configure): 
 subprocess installed post-installation script returned error exit status 1 
Errors were encountered while processing: 
 google-cloud-sdk 
 
dpkg: error processing package google-cloud-sdk (--configure): 
 subprocess installed post-installation script returned error exit status 1 
Errors were encountered while processing: 
 google-cloud-sdk 
 
 
# sudo dpkg --configure -D 777 google-cloud-sdk 
D000001: ensure_diversions: new, (re)loading 
D000001: process queue pkg google-cloud-sdk:all queue.len 0 progress 1, try 1 
D000040: checking dependencies of google-cloud-sdk:all (- <none>) 
D000400:   checking group ... 
D000400:     checking possibility  -> python2.7 
D000400:       checking non-provided pkg python2.7:amd64 
D000400:       is installed, ok and found 
D000400:     found 3 
D000400:   found 3 matched 0 possfixbytrig - 
D000040: ok 2 msgs >><< 
D000040:     checking Breaks 
Setting up google-cloud-sdk (131.0.0-0) ... 
D000002: fork/exec /var/lib/dpkg/info/google-cloud-sdk.postinst ( configure 129.0.0-0 ) 
dpkg: error processing package google-cloud-sdk (--configure): 
 subprocess installed post-installation script returned error exit status 1 
D000001: ensure_diversions: same, skipping 
Errors were encountered while processing: 
 google-cloud-sdk 
 
 
# sudo /usr/bin/gcloud components post-process 
 
Compiling platform/gsutil/third_party/httplib2/python3/httplib2/__init__.py ... 
  File "platform/gsutil/third_party/httplib2/python3/httplib2/__init__.py", line 350 
    print('%s:' % h, end=' ', file=self._fp) 
                        ^ 
SyntaxError: invalid syntax 
 
ERROR: gcloud crashed (CommandLoadFailure): Problem loading gcloud.dns.record-sets.import: 'module' object has no attribute 'CAA'. 
 
If you would like to report this issue, please run the following command: 
  gcloud feedback 
 
 
# sudo which python; sudo python --version 
/usr/bin/python 
Python 2.7.12 
 
# sudo which python3; sudo python3 --version 
/usr/bin/python3 
Python 3.5.2 

Trace: 
/usr/lib/google-cloud-sdk/gcloud_main.py:130 
 gcloud_cli.Execute() 
  [...] 
/usr/lib/google-cloud-sdk/calliope/backend.py:1630 
 resources = command_instance.Run(args) 
surface/components/post_process.py:40 
 table.Update(self.cli) 
/usr/lib/google-cloud-sdk/command_lib/static_completion/table.py:154 
 table = CompletionTableGenerator(cli).Wa... 
/usr/lib/google-cloud-sdk/calliope/walker.py:98 
 root.LoadAllSubElements(recursive=True) 
/usr/lib/google-cloud-sdk/calliope/backend.py:1490 
 element.LoadAllSubElements(recursive=rec... 
/usr/lib/google-cloud-sdk/calliope/backend.py:1490 
 element.LoadAllSubElements(recursive=rec... 
/usr/lib/google-cloud-sdk/calliope/backend.py:1488 
 element = self.LoadSubElement(name) 
/usr/lib/google-cloud-sdk/calliope/backend.py:1528 
 parent_group=self) 
/usr/lib/google-cloud-sdk/calliope/backend.py:1592 
 self._GetModuleFromPath(module_dir, modu... 
/usr/lib/google-cloud-sdk/calliope/backend.py:1258 
 name_to_give, os.path.join(module_dir, *... 
/usr/lib/google-cloud-sdk/core/util/pkg_resources.py:108 
 module = imp.load_module(name_to_give, f... 
surface/dns/record_sets/import.py:19 
 from googlecloudsdk.api_lib.dns import i... 
/usr/lib/google-cloud-sdk/api_lib/dns/import_util.py:162 
 rdatatype.CAA: _CAATranslation, 
CommandLoadFailure: Problem loading gcloud.dns.record-sets.import: 'module' object has no attribute 'CAA'. 
[output truncated] 

# sudo gcloud --version 
Google Cloud SDK 131.0.0 
alpha 2016.10.17 
beta 2016.10.17 
bq 2.0.24 
bq-nix 2.0.24 
core 2016.10.17 
core-nix 2016.10.17 
gcloud  
gsutil 4.21 
gsutil-nix 4.21 

请您参考如下方法:

直接原因可能是内存不足。
尝试在升级前添加交换。

sudo dd if=/dev/zero of=/var/swap bs=2048 count=524288 
sudo chmod 600 /var/swap 
sudo mkswap /var/swap 
sudo swapon /var/swap 
sudo apt upgrade