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$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/1,692 kB of archives.
After this operation, 911 kB disk space will be freed.
Do you want to continue? [Y/n] y
Reading changelogs... Done
(Reading database ... 179268 files and directories currently installed.)
Preparing to unpack .../login_1%3a4.2-3+deb8u3_amd64.deb ...
Unpacking login (1:4.2-3+deb8u3) over (1:4.2-3+deb8u1) ...
dpkg: error processing archive /var/cache/apt/archives/login_1%3a4.2-3+deb8u3_amd64.deb (--unpack):
unable to install new version of `/bin/su': Device or resource busy
Processing triggers for man-db (18.104.22.168-5) ...
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
Could somebody please help me with this? I've searched this forum & Google, but I haven't found a solution. I guess the problem is that I try to upgrade a package that I'm using. Thanks in advance!
Soluton: it worked when I logged in with root for a little time.