I think the problem is that you cannot use snapshot.debian.org directly as a source of packages. To see this, select a URL from that site as the source in sources.list, e.g.,
deb http://snapshot.debian.org/archive/debian/20151018T155352Z/ testing main
deb-src http://snapshot.debian.org/archive/debian/20151018T155352Z/ testing main
(commenting out the other settings), and doing
apt-get update
to force it to use only that source (as done in Downgrade and force some packages on Debian to a previous version). When I do this, I get
$ apt-get update
Hit http://snapshot.debian.org testing InRelease
E: Release file for http://snapshot.debian.org/archive/debian/20151018T155352Z/dists/testing/InRelease is expired (invalid since 16d 9h 47min 8s). Updates for this repository will not be applied.
That was the last snapshot before 1.9.2-2 was released. Instead, found in a mailing list reply Re: Plasma 5 doesn't start after update on Stretch by Matthias Bodenbinder, he suggested
- downloading the specific version needed
- install the package, i.e., using
dpkg
- pin the (now-installed) package (his example uses no origin).
To test the instructions, I used these links from the initial release of subversion_1.9.1-1:
and installed them:
$ dpkg -i libsvn1_1.9.1-1_amd64.deb subversion-tools_1.9.1-1_amd64.deb subversion_1.9.1-1_amd64.deb
dpkg: warning: downgrading libsvn1:amd64 from 1.9.2-2 to 1.9.1-1
(Reading database ... 371500 files and directories currently installed.)
Preparing to unpack libsvn1_1.9.1-1_amd64.deb ...
Unpacking libsvn1:amd64 (1.9.1-1) over (1.9.2-2) ...
Preparing to unpack subversion-tools_1.9.1-1_amd64.deb ...
Unpacking subversion-tools (1.9.1-1) over (1.9.1-1) ...
Preparing to unpack subversion_1.9.1-1_amd64.deb ...
Unpacking subversion (1.9.1-1) over (1.9.1-1) ...
Setting up libsvn1:amd64 (1.9.1-1) ...
Setting up subversion (1.9.1-1) ...
Setting up subversion-tools (1.9.1-1) ...
Processing triggers for libc-bin (2.19-22) ...
Processing triggers for man-db (2.7.4-1) ...
Then (in /etc/apt/preferences.d/subversion
):
Package: libsvn1
Pin: version 1.9.1-1
Pin-Priority: 1000
Package: subversion-tools
Pin: version 1.9.1-1
Pin-Priority: 1000
Package: subversion
Pin: version 1.9.1-1
Pin-Priority: 1000
and finally
$ apt-cache policy
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://ftp.us.debian.org/debian/ testing-updates/main Translation-en
500 http://ftp.us.debian.org/debian/ testing-updates/main amd64 Packages
release o=Debian,a=testing-updates,n=stretch-updates,l=Debian,c=main
origin ftp.us.debian.org
500 http://security.debian.org/ testing/updates/main Translation-en
500 http://security.debian.org/ testing/updates/main amd64 Packages
release o=Debian,a=testing,n=stretch,l=Debian-Security,c=main
origin security.debian.org
500 http://ftp.us.debian.org/debian/ testing/main Translation-en
500 http://ftp.us.debian.org/debian/ testing/main amd64 Packages
release o=Debian,a=testing,n=stretch,l=Debian,c=main
origin ftp.us.debian.org
Pinned packages:
subversion -> 1.9.1-1
libsvn1 -> 1.9.1-1
subversion-tools -> 1.9.1-1