Thanks to all who responded. This problem makes me post from a Windows laptop and transfer terminal output via thumb drive to the laptop. Not pretty.
To David: Yes, I have done a cold reboot since upgrading. # apt update 0% [Connecting to deb.debian.org] [Connecting to qgis.org] [Connecting to brave-browser-apt-release.s3.brave.com]^C [cancelled early] # apt update Err:1 http://deb.debian.org/debian buster InRelease Temporary failure resolving 'deb.debian.org' Err:2 https://qgis.org/debian buster InRelease Temporary failure resolving 'qgis.org' Err:3 https://brave-browser-apt-release.s3.brave.com stable InRelease Temporary failure resolving 'brave-browser-apt-release.s3.brave.com' 0% [Working]^C [cancelled later] # apt upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: libqgis-3d3.18.0 libqgis-analysis3.18.0 libqgis-app3.18.0 libqgis-core3.18.0 libqgis-gui3.18.0 libqgis-native3.18.0 libqgis-server3.18.0 libqgisgrass7-3.18.0 libqgispython3.18.0 Use 'apt autoremove' to remove them. The following NEW packages will be installed: libqgis-3d3.18.1 libqgis-analysis3.18.1 libqgis-app3.18.1 libqgis-core3.18.1 libqgis-gui3.18.1 libqgis-native3.18.1 libqgis-server3.18.1 libqgisgrass7-3.18.1 libqgispython3.18.1 The following packages will be upgraded: libqgis-customwidgets python3-qgis python3-qgis-common qgis qgis-common qgis-plugin-grass qgis-plugin-grass-common qgis-provider-grass qgis-providers qgis-providers-common 10 upgraded, 9 newly installed, 0 to remove and 0 not upgraded. Need to get 105 MB of archives. After this operation, 91.5 MB of additional disk space will be used. Do you want to continue? [Y/n] y Err:1 https://qgis.org/debian buster/main amd64 qgis-plugin-grass amd64 1:3.18.1+15buster Temporary failure resolving 'qgis.org' [this continues to Err:19 then more] Have not changed any of the gateway settings that I'm aware of. This laptop is the only other computer but it runs Windows. Is that testing name resolution with another computer? # ifconfig eno1 eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.66 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 ****:****:***:****:****:****:****:**** prefixlen 64 scopeid 0x0<global> inet6 ****::****:****:****:**** prefixlen 64 scopeid 0x20<link> ether **:**:**:**:**:** txqueuelen 1000 (Ethernet) RX packets 10009 bytes 1101640 (1.0 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1734 bytes 180973 (176.7 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 # cd /etc # cat resolv.conf domain attlocal.net search attlocal.net nameserver 192.168.1.254 [something removes additional nameserver lines that I add] # cat /etc/debian_version ; uname -a 10.9 Linux deb4 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64 GNU/Linux $ nmcli g status $ nmcli c show $ nmcli d show [I don't seem to have nmcli] # host -v -t A www.debian.org 8.8.8.8 Trying "www.debian.org" Using domain server: Name: 8.8.8.8 Address: 8.8.8.8#53 Aliases: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58963 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.debian.org. IN A ;; ANSWER SECTION: www.debian.org. 299 IN A 128.31.0.62 www.debian.org. 299 IN A 149.20.4.15 Received 64 bytes from 8.8.8.8#53 in 102 ms # host -v -t A www.debian.org Trying "www.debian.org" ;; connection timed out; no servers could be reached Thanks for your detailed help. Let me know if I can dig out more. - Dan
