596. Debian Jessie -- shutdown takes 'forever' (five minutes according to stopwatch!)

I've been annoyed for a couple of months now that shutting down my laptop, which has an SSD, takes up to five minutes. If I wanted that kind of shutdown times I could run Windows Vista...

Either way, it turns out that it's affecting certain systems with samba:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762002

The issue is illustrated below, which showed that it took five minutes to shut down samba -- and that's what's preventing the system from shutting down:

sudo service samba stop
ps aux|grep sam && date

root      2765  0.0  0.0  65468  2100 pts/0    S+   10:45   0:00 sudo service samba stop
root      2766  0.0  0.0  26252  1172 pts/0    S+   10:45   0:00 systemctl stop samba.service
root      2785  0.0  0.0   4308   636 ?        Ss   10:45   0:00 /bin/sh /etc/init.d/samba stop
Sunday 12 October  10:49:28 AEDT 2014

The solution is pretty simple though -- remove a set of symlinks:

First establish that they are present:

me@oxygen:/etc$ find rc* -name "*samba*"|xargs -I {} ls {} -lah
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc0.d/K01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc0.d/K01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc1.d/K01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc1.d/K01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc2.d/S01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc2.d/S01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc3.d/S01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc3.d/S01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc4.d/S01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc4.d/S01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc5.d/S01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc5.d/S01samba-ad-dc -> ../init.d/samba-ad-dc
lrwxrwxrwx 1 root root 15 Sep 16  2013 rc6.d/K01samba -> ../init.d/samba
lrwxrwxrwx 1 root root 21 Sep 15 10:46 rc6.d/K01samba-ad-dc -> ../init.d/samba-ad-dc

Then remove them:

me@oxygen:/etc$ sudo update-rc.d samba remove 
me@oxygen:/etc$ sudo update-rc.d smbd remove 

Done!

595. Issue upgrading debian jessie -- stuck at systemd

Doing a dist-upgrade yesterday (9th of October 2014) it failed because of issues with configuring systemd. In the end my troubleshooting didn't help, but google did.

---

Dead-end troubleshooting:

Trying to work through it:

sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 systemd-sysv : Depends: systemd (= 208-8) but 215-5+b1 is installed
E: Unmet dependencies. Try using -f.

Checking why systemd-sysv is mentioning 208-8 instead of 215-5:

apt-cache policy systemd-sysv
systemd-sysv:
  Installed: 208-8
  Candidate: 215-5+b1
  Version table:
     215-5+b1 0
        500 http://ftp.iinet.net.au/debian/debian/ testing/main amd64 Packages
 *** 208-8 0
        100 /var/lib/dpkg/status

Let's try forcing 215-5:

sudo apt-get install systemd-sysv=215-5+b1
Reading package lists... Done
Building dependency tree       
Reading state information... Done
[..]
The following packages will be upgraded:
  systemd-sysv
1 upgraded, 0 newly installed, 0 to remove and 531 not upgraded.
422 not fully installed or removed.
Need to get 0 B/29.1 kB of archives.
After this operation, 3,072 B of additional disk space will be used.
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
Setting up systemd (215-5+b1) ...
dpkg: error processing package systemd (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 systemd
E: Sub-process /usr/bin/dpkg returned an error code (1)

OK, let's try working on systemd:

sudo dpkg -D2 --configure systemd
Setting up systemd (215-5+b1) ...
D000002: fork/exec /var/lib/dpkg/info/systemd.postinst ( configure 208-8 )
dpkg: error processing package systemd (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 systemd

---

Solving it:
No luck. Google wasn't too helpful initially, until I came across https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762275

sudo delgroup systemd-journal
Removing group `systemd-journal' ...
Done.

Then tried

sudo dpkg -D2 --configure systemd
Setting up systemd (215-5+b1) ...
D000002: fork/exec /var/lib/dpkg/info/systemd.postinst ( configure 208-8 )
/var/lib/dpkg/info/systemd.postinst: 128: /var/lib/dpkg/info/systemd.postinst: cannot open /run/systemd/was-enabled: No such file

and

sudo apt-get install -f
[..]
Do you want to continue? [Y/n] Y
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
(Reading database ... 462023 files and directories currently installed.)
Preparing to unpack .../systemd-sysv_215-5+b1_amd64.deb ...
Unpacking systemd-sysv (215-5+b1) over (208-8) ...
Processing triggers for man-db (2.6.7.1-1) ...
Setting up systemd-sysv (215-5+b1) ...
[..]

and then

sudo apt-get dist-upgrade

works again!

Many reasons to dislike systemd, although in this case I guess it's poor packaging.

594. Very, very briefly: Speedtest your WLAN

As shown here: http://firstin-lastout.com/2013/07/how-to-test-wifi-speed/

Install iperf: sudo apt-get install iperf

Open two terminal windows on the same computer:

Terminal 1$ iperf -s -u -i1

------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------

Terminal 2$ iperf -c 192.168.2.1 -u -i1 -l 1300 -b 100m -t 600

------------------------------------------------------------
Client connecting to 192.168.2.1, UDP port 5001
Sending 1300 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.2.110 port 56520 connected with 192.168.2.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  4.46 MBytes  37.4 Mbits/sec
[  3]  1.0- 2.0 sec  4.45 MBytes  37.3 Mbits/sec
[  3]  2.0- 3.0 sec  4.28 MBytes  35.9 Mbits/sec
[  3]  3.0- 4.0 sec  4.32 MBytes  36.2 Mbits/sec
[  3]  4.0- 5.0 sec  4.42 MBytes  37.1 Mbits/sec
[  3]  5.0- 6.0 sec  4.35 MBytes  36.5 Mbits/sec
[  3]  6.0- 7.0 sec  4.39 MBytes  36.8 Mbits/sec
[  3]  7.0- 8.0 sec  4.35 MBytes  36.5 Mbits/sec
[  3]  8.0- 9.0 sec  4.41 MBytes  37.0 Mbits/sec

Where 192.168.2.1 is my wireless router.