我的 Ubuntu 20.04.1 LTS Unity shell 会定期重启，有时一天一次，有时连续三次。它会关闭除终端、文件窗口、系统更新对话框和其他应用程序之外的所有应用程序，但通常不会。
我之前在 Ubuntu 19.10 中遇到过同样的问题。
以下是崩溃时的系统日志：
Aug 26 23:17:27 beast systemd-resolved[1253]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Aug 26 23:17:28 beast dockerd[2035]: time="2020-08-26T23:17:28.032798321+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:28 beast dockerd[2035]: time="2020-08-26T23:17:28.035448508+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:29 beast dockerd[2035]: time="2020-08-26T23:17:29.038435017+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:29 beast dockerd[2035]: time="2020-08-26T23:17:29.040647835+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:30 beast dockerd[2035]: time="2020-08-26T23:17:30.044828305+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:30 beast dockerd[2035]: time="2020-08-26T23:17:30.046683184+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:31 beast dockerd[2035]: time="2020-08-26T23:17:31.047730460+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:31 beast dockerd[2035]: time="2020-08-26T23:17:31.049981440+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:32 beast dockerd[2035]: time="2020-08-26T23:17:32.054518337+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:32 beast dockerd[2035]: time="2020-08-26T23:17:32.057609151+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:33 beast dockerd[2035]: time="2020-08-26T23:17:33.058327671+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:33 beast dockerd[2035]: time="2020-08-26T23:17:33.060558553+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:34 beast dockerd[2035]: time="2020-08-26T23:17:34.063207333+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:34 beast dockerd[2035]: time="2020-08-26T23:17:34.065389223+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:34 beast rtkit-daemon[1871]: Supervising 0 threads of 0 processes of 0 users.
Aug 26 23:17:34 beast rtkit-daemon[1871]: Successfully made thread 3168242 of process 3113 owned by '1000' RT at priority 5.
Aug 26 23:17:34 beast rtkit-daemon[1871]: Supervising 1 threads of 1 processes of 1 users.
Aug 26 23:17:35 beast dockerd[2035]: time="2020-08-26T23:17:35.067611343+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:35 beast dockerd[2035]: time="2020-08-26T23:17:35.069812198+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:36 beast dockerd[2035]: time="2020-08-26T23:17:36.072274940+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:36 beast dockerd[2035]: time="2020-08-26T23:17:36.074356540+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:37 beast dockerd[2035]: time="2020-08-26T23:17:37.076634902+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:37 beast dockerd[2035]: time="2020-08-26T23:17:37.078785552+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:38 beast dockerd[2035]: time="2020-08-26T23:17:38.081456291+02:00" level=error msg="collecting stats for d64358a43e6a940fc352948fd2368ac5d200a729a5b6ba99e531f9bae3923cd2: no such container"
Aug 26 23:17:38 beast dockerd[2035]: time="2020-08-26T23:17:38.083724905+02:00" level=error msg="collecting stats for 73233e95b937634ced5f03cb6dd3c3a2bdbd8a8a1be5390272247920e34f2f90: no such container"
Aug 26 23:17:38 beast systemd[3106]: unity7.service: State 'stop-sigterm' timed out. Killing.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 2722682 (_Postman) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167460 (_Postman) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167467 (_Postman) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 2722709 (gdbus) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 2722733 (_Postman) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 2722736 (ThreadPoolSingl) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 2722763 (CacheThread_Blo) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167452 (ThreadPoolForeg) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167462 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167481 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167483 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167486 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167487 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167500 (ThreadPoolServi) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167501 (ThreadPoolForeg) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3167503 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3168253 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3168258 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Killing process 3168265 (n/a) with signal SIGKILL.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Failed with result 'core-dump'.
Aug 26 23:17:38 beast systemd[3106]: unity7.service: Scheduled restart job, restart counter is at 4.
Aug 26 23:17:38 beast systemd[3106]: Stopped target User systemd services for the Unity graphical session.
Aug 26 23:17:38 beast systemd[3106]: Stopping User systemd services for the Unity graphical session.
Aug 26 23:17:38 beast systemd[3106]: Stopped Unity Shell v7.
我可以尝试什么来阻止它？