European cable groups are increasingly looking to acquire both fixed and mobile networks to improve on the profitability of their model, compared to cable alone. Liberty Global is set to re-enter the German fixed-line business, teaming up with private equity firm InfraVia Capital Partners to invest in rolling out fiber infrastructure in the country, two years after it sold its Unitymedia cable operation to Vodafone. However, the 50:50 joint venture with InfraVia is, at this stage, a financial investment rather than a return to the operational market. Liberty as generally been shedding cable assets in Europe to focus on more profitable operations such as Virgin Media in the UK and Ireland, Sunrise UPC in Switzerland, Telenet in Belgium and VodafoneZiggo…