我的 X11 桌面最近因为同样的原因崩溃了
/var/log/kern.log:Oct 9 14:55:29 alpha kernel: [ 51.560789] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 10 20:53:30 alpha kernel: [ 1.316375] Initialise system trusted keyrings
/var/log/kern.log:Oct 10 20:53:30 alpha kernel: [ 1.566875] Key type trusted registered
/var/log/kern.log:Oct 10 20:53:30 alpha kernel: [ 49.866048] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 10 20:53:31 alpha kernel: [ 52.359018] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 10 20:53:31 alpha kernel: [ 52.607128] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 10 20:53:31 alpha kernel: [ 52.609413] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 10 20:53:31 alpha kernel: [ 52.611961] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 05:21:14 alpha kernel: [ 1.332628] Initialise system trusted keyrings
/var/log/kern.log:Oct 11 05:21:14 alpha kernel: [ 1.586145] Key type trusted registered
/var/log/kern.log:Oct 11 05:21:14 alpha kernel: [ 48.973431] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 05:21:15 alpha kernel: [ 51.242295] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 05:21:15 alpha kernel: [ 51.496355] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 05:21:15 alpha kernel: [ 51.499499] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 05:21:15 alpha kernel: [ 51.504483] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 14:42:55 alpha kernel: [ 1.332616] Initialise system trusted keyrings
/var/log/kern.log:Oct 11 14:42:55 alpha kernel: [ 1.590843] Key type trusted registered
/var/log/kern.log:Oct 11 14:42:55 alpha kernel: [ 48.803714] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 14:42:56 alpha kernel: [ 51.291135] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 14:42:56 alpha kernel: [ 51.536567] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 14:42:56 alpha kernel: [ 51.540598] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 14:42:56 alpha kernel: [ 51.543458] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 19:55:41 alpha kernel: [ 1.332554] Initialise system trusted keyrings
/var/log/kern.log:Oct 11 19:55:41 alpha kernel: [ 1.592800] Key type trusted registered
/var/log/kern.log:Oct 11 19:55:41 alpha kernel: [ 48.956084] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 19:55:42 alpha kernel: [ 51.173503] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 19:55:42 alpha kernel: [ 51.414123] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 19:55:42 alpha kernel: [ 51.416660] PKCS#7 signature not signed with a trusted key
/var/log/kern.log:Oct 11 19:55:42 alpha kernel: [ 51.419845] PKCS#7 signature not signed with a trusted key
/var/log/syslog:Oct 9 10:16:58 alpha kernel: [ 1.316754] Initialise system trusted keyrings
我的机器：
$ neofetch
.-/+oossssoo+/-. gaowei@alpha
`:+ssssssssssssssssss+:` ------------
-+ssssssssssssssssssyyssss+- OS: Ubuntu 19.04 x86_64
.ossssssssssssssssssdMMMNysssso. Host: MacBookPro11,1 1.0
/ssssssssssshdmmNNmmyNMMMMhssssss/ Kernel: 5.0.0-29-generic
+ssssssssshmydMMMMMMMNddddyssssssss+ Uptime: 19 hours, 52 mins
/sssssssshNMMMyhhyyyyhmNMMMNhssssssss/ Packages: 2367 (dpkg), 4 (snap)
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Shell: bash 5.0.3
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Resolution: 2560x1600
ossyNMMMNyMMhsssssssssssssshmmmhssssssso DE: KDE
ossyNMMMNyMMhsssssssssssssshmmmhssssssso WM: KWin
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Theme: Breeze [KDE], Breeze [GTK3]
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Icons: breeze [KDE], breeze [GTK3]
/sssssssshNMMMyhhyyyyhdNMMMNhssssssss/ Terminal: alacritty
+sssssssssdmydMMMMMMMMddddyssssssss+ CPU: Intel i5-4258U (4) @ 2.900GHz
/ssssssssssshdmNNNNmyNMMMMhssssss/ GPU: Intel Haswell-ULT
.ossssssssssssssssssdMMMNysssso. Memory: 2457MiB / 3850MiB
-+sssssssssssssssssyyyssss+-
`:+ssssssssssssssssss+:`